It's not going to be that bad.

Don't get all hyped up about people calling nerf, just keep a positive outlook and be prepared to adapt to the change. I'm talking about PvE btw - I stopped doing PvP after I moved servers. Anyway, if you're prepared to adapt, you'll be fine. I tried, as a test, to do a few dungeon runs without ToW (used searing instead) and with only one tremor and tbh it was pretty much the same except for the risk of a few seconds extra fear (keep in mind that that wasn't heroics, which would be a different ballgame but we know so little about WotLK instances so far that it's impossible to say anything about those atm). Yes, some of the changes suck, but most you won't even notice and some are actually buffs.

I'm running a pala + shaman team with a warlock and/or druid ready to swap in when CoE includes nature damage (assuming patch 3.0) - the only thing im really annoyed about is having to regear my paladin when they change strength to be useful and that's quick to recover form.

It's like reading the official forums, if you were to believe everyone whining and QQ'ing about nerfs to own class and buffs to other classes, the game would be broken. It's in Blizzards interest to make the game enjoyable for everyone - we pay them to do so.

Worst case scenario is that you have to swap a character or two in your team and with the gear reset at WotLK launch, that's a small effort. Think RAF + 60-70 exp buff in 3.0 - we're talking like 3-4 days played = 2 new level 70 chars.