Being a Star Trek fan, I thought STO could be that for me, my MMO to which I dedicated near-absurd amounts of time, and while I enjoyed it, it didn't really catch me like I wanted it to.
Kingdoms of Amalur was actually going to have an MMO based on before things went sour with the dev and publisher and that and the sequel were discarded. With how much I enjoyed Amalur, I'm sure I would've loved it.
Until I can find one I'll just keep going through singleplayer RPGs of yesteryear, like Planescape, Icewind Dale, Nevermind, etc. Some of I've played, some I've not, and occasionally dip my toes into an MMO here and there to see if anything pulls me in.
Good luck anon, see you there whenever it happens