We've all seen this : MNK is good.
Right now, general idea make it sucks, nothing else. To change a general idea, you just have to make people want to play MNK, not by buffing it, or nerfing others, but by making it fun to play...that's why I think : Make a new combat system, especially for MNK.

What system ? Fighting game system ! Or, more accurately, FFVI system. Remove all TP cost of Pugilist/MNK WS, and make people do command input to unleash them.
For all of us who loved Sabin in FFVI, it'll feel really FINAL FANTASY-ish.
And for others, they'll say, "Ok, I'll try it, it's a really nice change of pace...hey, wait a minute ! This job is actually pretty good !"

There, new trend launched ! Everybody love MNK