Luckily with MoP essentially all dps specs are viable, at least in PvE. I can't speak for PvP, but it seems a lot of hunters are finding success there as well. Its not surprising to see nerfs at the start of a major content patch and think your class will suffer, but typically they are made because of scaling and upcoming gear selection, not to actually hamper the class as was.
Great example, Syiler's US Shaman received incredible percentage nerfs to his main abilities and he was ready to level a weapon Warrior to DPS for our guild assuming it would be so crippling the spec would be useless. Now he is the top single target damage on any fight with standstill opportunity!
If you enjoy the game, and the class you are playing, you shouldn't let a nerf or change deter you. Good players can always make any spec outstanding.