Scott Christian
Hero
This.6e should have a core setting.
That core 6e setting should be designed from scratch.
Official settings and playstyles should be the 6e core setting with modifications and name changes.

All other books could deal with other settings in different planes (places that already exist like Eberron or Dark Sun). This way they can avoid the race debate. They can add a gazillion new classes. They can add science fiction if they want. Whatever. Each half year or quarter, come out with a new place and an adventure that accompanies it. Then also, come out with an adventure and region of the made from scratch setting.
Developing something new will get the writers going. Old timers seeing their past represented will make them happy. And, most importantly for me, a clear demarcation regarding one area's classes and races and sub-rules will exist.