The only thing 4e needs, IMO are three things that keep it from absolute gaming perfection:
I want a power refresh mechanic. I hate the entire notion of daily anything. Everything should be balanced per encounter.
I also wish each class had a variant suite of powers that excised all the grid based movement mechanics so that you could play it miniless. I like minis, but sometimes I just don't want to bust out the battlemat.
There should also be a mechanic to speed up ritual casting time and you should be able to cast rituals in combat.
Thats it. Other than that, 4e is my ideal RPG.
As far as edition wars go, it was ultimately inevitable. Everything I like in 4e are the very things that some 3e fans hate, and everything they like in 3e are things I hate and consider bad game design. Its just not possible to make a game system that both sets of fans love since our likes and dislikes are fundamentally incompatible.