And your sound argument is to merely state it wouldn't hurt to implement without proving it's need.
As I understand, the respec cost cap is 50? that's what it was when I was still jumping speccs.
Now today you can get more then enough to handle respecc costs from dailies, soloing dungeons, or selling a single item (sometimes even simply to a vendor). No speccs have any glaringly obvious difficulty in handling solo play unless the term solo is taken to mean soloing raids and or dungeons or other group gameplay.
Again. Why is it even needed? I'm not questioning that it isn't wanted or that it wouldn't see use by people. But I see no reason to implement it into WoW in the games current state.