While I do believe, 4e could be made a little simpler, just by allowing classes to draw from a pool of similar powers, it is already there.
Essential style classes allow 4e to be a flexible and good game. And it is still supported in dragon magazine.
And I really hope, it will be supported forever. Even with new material. And actually, i see no problem. If people submit 4e content, there will be, i guess. Right now we are getting even quite some nice adventures via dungeon. Interesting ones.
So while some people fokus on bashing wotc for abandoning 4e, it is still alive. And with DDI they are still making money out of it. And hopefully they will long after next is hitting the shelves...
and now look at dndclassics.com ... they are proving, that they are commited to support every edition of DnD... they have realised, that making material for every edition available again is the right thing to do. Labeled dnd classic, it is clear, that those are older editions.
And next will be the goto edition for everyone, who wants the newest iteration, but noone is forced to play it.
And with the modular design, they are doing well designing edition neutral adventures... why not... we have the monstrous compendium for stats, whatever edition i like. And with the monster builder of 4e, i have a great way organizing the monsters and encounters...
Maybe i am wrong, but besides some few edition warriors, dnd next seems to do exactly what it should do... please those people, who want a modern system that feels like classic dnd. 3e and 4e people already have that and have enough books and material forever... frankly... most of them won´t give wotc their money anyway...