Players getting to 85 and raiding in easy mode is not exactly the destruction of mankind. They can still learn and get gear for the Firelands stuff... it will even give raiding guilds a bigger pool of raider-replacements.
Good players will still be good and lesser players can wait on the Firelands nerfs.
It's all for the best really.
I agree with you, however I view the nerfing of current normal content as unnecessary. On one side you have lazier players who won't even clear the content regardless, and on the other you have people who would like to learn to raid. One side doesn't even get what it wants from the nerf, and the other is done a disservice.