You can still use the downranked spells to generate less threat if need be, they just won't be any cheaper mana-wise, e.g.; you'll still have rank 1 heal in your spell book.  (At least that's how it sounds from what I've seen thus far.)

Is it times you don't have salv in 5/10 mans?   Cause with the elimination of salv in Wrath, tanks will innately generate more threat on their own. 

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More blue posts on the Downranking elimination, lots of QQ in the thread but Neth does answer back quite a few times:  http://forums.worldofwarcraft.com/thread.html?topicId=9023603225&pageNo=...

We've been very forthcoming with the truth. Let's
look at it from this angle. Downranking added a lot of extra
considerations to design and balance. When people downrank, it changes
the complexities of different encounters and how those complexities
play into the design. We don't want to penalize people using low ranked
spells because this doesn't quite address the issue of downranking
either. So what we're doing instead is finding a consistent cost of
mana across the board and making it so that when you rank up, you get
more benefit out of that higher ranked spell. The cost should remain
largely consistent as you go along.

What Zarhym has said and what Wryxian has said are not at odds with
each other. One is simply saying "this wasn't intended" the other was
saying "if you're going to do it, this is the strategy people are
using" and highlighting someone elses' post. We are not advocating
downranking, but we are now making it a thing of the past.

That said, there are other things that people need to remember when considering this change:

• We anticipate there being some balance concerns and problems
  due to this change, and will be ready to implement new spells,
  abilities, or talents to resolve those issues as we feel are necessary.
  Consider that we are working to make sure that the impact of these
  changes isn't going to affect people negatively.
• The change is factoring in BASE mana and is not taking
  into account the added bonuses of intellect, buffs, potions, etc. Base
  mana is just that. It's looking at the very foundation of your
  character and basing the mana cost from that.
• It is known that some players may need to readjust their
  playstyle a bit to accomodate this change. Whether it's focusing more
  on regeneration, efficient allocation of healing, and utilizing the
  full range of spells and abilities within their repertoire.
• This is still a work in progress. Adjustments will be
  made, but these will be made based on testing and experiences within
  the beta. This change isn't being removed, but will be adjusted as
  needed. Keep in mind also, that this change affects all ranks of spells
  and abilities that use mana so we will be keeping a close eye on what
  is occurring at both the lower end and at the higher end to achieve the
  best possible results overall.
• Within the beta, people are gaining a lot of new
  abilities and are still getting used to what these can do and where the
  potential issues may be. The mana change is only one factor in this
  experience and it's important to keep an eye on how these changes are
  affecting everything as a whole.
• Constructive Feedback- We can not stress how important
  this is. Pointing fingers, or "he said, she said" isn't going to help
  with getting the maximum value out of this change. Testing, trying
  things out, weighing and balancing experiences and reporting them to
  us, this is important. This is the best possible time for this feedback
  because changes are occurring right now. Could more changes follow even
  after the release of the expansion? Of course. We are always watching
  and keeping tabs on what is occurring with players.

In the end of all this, it's important to realize that we aren't
making this change arbitrarily. We also understand that this change was
going to bring about a lot of conversation. The message is still the
same as when we first put it up. We are getting rid of downranking, but
we are doing it in a way that we feel is the most beneficial and are
keeping a close eye on what may still need adjusted to maximize the
overall benefit of this change. 

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hmmm how they implement our mana regen changes iwll make or break this

http://forums.worldofwarcraft.com/thread.html?topicId=8765645374&sid=2003

As you may have noticed, in this latest build we
have updated spells and abilities using mana. These no longer cost a
fixed amount and instead they're a percentage of your base bana, not
including any mana increase from Intellect. For the most part this
should mean mana-based spells and abilities are costing roughly the
same amount as they do in the live game, though there might be some
slight changes either up or down. But we have tried to keep them as
close as possible to the same mana cost for a level 70 as they are now
in the live game.

What will change though is that lower rank spells will lose their
appeal. We have made this mana cost change purely to prevent
downranking, which is an unintended technique that we were not at ease
with. We've previously tried ways to discourage it, but have decided
that we'd rather find a solution than continue to find ways to penalise
those who choose to downrank. The solution we chose was to make
downranking obsolete, encouraging people to always use their highest
rank of each spell and nothing else.The highest rank of a mana-based
spell or ability will now remain the most powerful effect, but at the
same mana cost as earlier ranks.

We're certain that for some people this will cause a period of
readjustment. Hopefully removing a few more of the extra buttons you've
been pressing will eventually be seen as a good thing; it might also be
easier for some people to do their role without having to learn to
downrank. We are anticipating such a big change may have some teething
problems, perhaps causing balance issues, and we're all set to deal
with them as they arise. In the meantime, we appreciate any comments
and feedback related to this change. 

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I love you Caronte, but for the love of Pete -

When you go to make a new topic, ONLY CLICK IT ONCE.

/deleted your other two identical threads