things from ffxi to start with = full linkshell events, large scale(more then 16-20) endgames(something like sky and dynamisis very important to me), nm's everywhere on the world, lots of mini bosses in quests, side quests and missions. hopefully cop mission like fights and main stories. gear swaping (not need to be like ffxi, make it new, make it fast and easy, main thing to be able to collect every piece of gear in game and it mattering, not tossing it to stupid company for points after done with it) more mobs in grinds and anywhere that are more dynamic and need debuffs on them and players more, enfeebling and what not.
things from other mmo's, i quess take anything from mmo's ffxi and before, not wow and beyond lol. i can't think of a thing i'd want from those mmo's in ffxiv. and sadly i been sitting here trying to think of something for awhile too.