I think, regardless of the amount of options presented, there's always going to be a BiS. I suppose you could argue that by presenting different skills when certain stat criteria is met it would add a different dimension to consider when choosing gear, but there's always going to be a "best". The only real difference I could see this adding would be changing a job's skill rotation. But in the end, it's still going to be kind of similar for everyone? I don't play MNK the same way everyone else does, but its not so dissimilar I could call it different? I don't know if I explained myself too well.

That's just my opinion anyway. I could see this working, I think, but at the same time I don't? Gah, whatever. lol