I am affraid

/cast Fear Ward
No no no… no need to be afraid my fellow Orcish friend, Berserker Rage isn't being removed in MoP!

On a more serious note, I do understand where you're coming from. I've been playing since vanilla and in my opinion it's normal to get attached to the mechanics that you've been using for so many years.
The thing is, that mix of nostalgia and being accustomed to certain mechanics makes it very hard for us to think in a completely fresh and unbiased way like a good game designer has to.

Stances aren't going away; they're just being converted to a kind of DK "presence" design, which is, in my opinion, a better design.
Don't get me wrong, I love playing warrior, it's one of my favourite classes, but having to stance dance to use certain abilities always felt a bit clunky and awkward to me, sure you can get used to it, you can even master it and enjoy having to use additional actions to activate all the different abilities, but let’s be honest here, that’s mostly a matter of having a ton of good macros that one can even just google up and copy paste, that’s not really skill now is it?
Basically that just makes it harder for a new player to master a warrior because he will have to understand macros or at the very least become aware of the need to grab them on the internet and use them.

Shield Wall, Recklessness, Retaliation, Pummel, Spell reflect, Charge, all of these used to be restricted to a certain stance in the past. Now some of them have no stance restrictions at all and others have them more relaxed.
So, even on live, stance dancing isn’t what it used to be, to me it feels like it has been slowly phased out, so now we can actually do a major overhaul on it with MoP and players won’t have to feel that an extreme change of play style has been forced upon them.

Now my argument is that this "clunkiness" might make experienced warriors feel like it's a good feature, something that requires skill and that distinguishes bad players from good ones, but that's just a twisted perception in my opinion. It's a case of an old design that remained in the game for far longer than it probably should have, making the balance in terms of abilities, skill and the required learning curve to play each class extremely hard to tune and balance over time.

As I said, this is my personal opinion, I could play it safe and give you a very politically correct answer that wouldn't cause any stir, but I think you all understand that on top of working for Blizzard, we're also players, like you, we also feel passion for our games and we all have our own different views and criticisms, so please take this with a grain of salt, everyone is entitled to their own views and we in community love when you share your own constructive ideas with us, if for example, most players feel that this change is a bad decision on our part we will make sure to pass that information along to the developers (we already have! But we can always emphasize its importance), which I'm sure will look at it very seriously.

Dynamic mmorpg's like WoW, that get new content over time are in a constant state of tuning, and there's always going to be situations like this happening from time to time, it's kind of unavoidable, it means the game is evolving, in the end I think that even players that complain a lot about having constant changes to the game probably end up enjoying the fact that the game isn't static, they just don't realize it because they haven't felt the boredom of a static game since WoW has never been that way.
Also, please note that MoP is still in beta, anything can still be changed, don’t take whatever was discussed here as a sign of a permanent change.