Homogenization seems to be largely a consequence of catering to "raiders" who push said metas thus requiring "balancing" by making everyone 50 shades of grey. Unfortunately the only challenging content FFXIV and most similar MMOs push out are raids. Even the current Xpac only has raids for endgame. Maps are not challenging enough to push a seperate meta, FATES are not challenging enough (or rewarding) to push a separate meta. The deep dungeons ARE challenging enough to push a meta, but usually only when solo as the group content tends to be fairly unrewarding outside glamour, and of course the glamour meta is anyone's guess.

About the only way to remove the "Meta" is by making an FFXIV-EX mode, making the overworld actually hard, to add actually challenging content outside of raids where having 2+ glass cannons is actually a detriment to groups. Right now only dps matters, as every rraid devolves into do more DPS to the boss before the enrage timer and the only thing that kills people is standing in fire.