MMOs are starting to move away from the talent tree model to some more interesting ideas.

WoW is now going to use a perk inspired system were every x levels you pick from one of three talents that have a similar general same aim, but achieve it in different ways.

GW2 is using a system where you distribute attribute points which unlock passives, some of which you can pick whilst some are fixed. http://www.gw2tools.com/

Maybe FFXIV could have a kind of system were you pick between different passives.

E.g. A Monk might have a selection of passives relating to Second Wind, of which only one can be picked - Second Wind heals more, or it has a shorter cooldown, or monk receives a 5 second defensive buff when using Second Wind.