People said the same thing about Warlocks not too long ago.
This is one of the reasons I don't like the new talent system. It took too many spec defining abilities (looking at shadowstep) and made them available to all three. It punishes pure dps classes by blending them too thoroughly and hybrids (esp tri role hybrids) by making things MORE cookie cutter.
So no, I don't think pures should have less than three, I think we just need the spec defining abilities put back in the specs instead of being accessible to all of them via the 'talents'.