The more I think about it the more it seems like everyone wins if blizzard focuses on mythic players. What do mythic players want? More dungeons and raids with decently tuned classes and nothing else.
How does everyone else win? Simple you just scale down the content and you get easier modes of what is designed and everyone gets more then they have now.
It isnt free mind you... such a system wouldn't tolerate choreghast, conduits, renowned, covenants , corruption and the assorted trash aimed at 80 hour a week " casuals" but I think this bold new approach might really revitalize the game.