Please grow the MMO part of the game. End game is lousy.

[Novae]

Deep dungeon.
Three 'Criterion' dungeons.
Ultimate and Unreal trials.
A new PvP mode.

There you go.

And even in this new content, healers won't be requiered. Criterion will probably have a lost action system, and iirc, healers will be nerfed into oblivion in their new pvp mode.
Ultimate is for less than 1%, and unreal is just old content.
I don't do deep dungeon but I think the holy trinity isn't needed there?

So if you're a healer like me, and many others, 6.1+ will have absolutely nothing interesting/new to offer.