What they should do is chuck everything from 3.5, 3.0 and previous editions. Their process of building each edition atop the previous ones has resulted in 3.5 being the Michael Jackson of RPGs, desperately improving itself to ward off obsolescence but attaining only a kind of perverse lichlike state as a mockery of healthier games.
D&D needs to be rewritten from the ground up, making sure to slaughter all of the sacred cows of old. The system, the abilities, the lot of it. This isn't the 1900s anymore, the game should reflect it instead of trying to sell us on the same old nonsense in a new wrapper.