One may ask why the content has tailed off so badly. The only explanation that makes sense is budget pressure.
So, 10.0 might do as you say, but only if Kotick opens the budget spigot. Do you think there's a realistic chance he'll do that, especially now with this lawsuit?
Beyond that, WoW might get a large infusion of money if the IP is sold to someone with deeper and more willing pockets. But I suspect if it's sold it will be turned into a P2W monstrosity instead.