C'mon people, don't he hatin', I know you want a joint effort of Bethesda and Obsidian. :fallout:
Actually, I don't.
Bethesda will want to stick to the sandbox map, which they are good at.
But I personally don't want a sandbox map, I want a map node system.
So since what Bethesda is good at is something I don't really want in a Fallout game I can't say I want a joint project.
If there's no other way though and it "has to be" a sandbox game then yes to Obsidian as they are the only saving grace for the franchise.
But it will end up being another "the best out of a bad situation" game just like NV was.