It's the same old argument basically: there are changes needed, for sure. But not the ones pushed, which albeit not the ones the userbase would like, surely move things forward for classes and specs.
However for the proposed changes of said classes and specs there would be the need of a rework akin to what Shadowpriests got. And those require work.
...and I sometimes fear the dev team left in charge of WoW doesn't have in them to do such a momentous task more than once or twice, without flunking the rest. And I don't want to sound bitter, but I do remember when I looked forward to expansion changes and sometimes patches too.