Re: What would it take to make Sasuke come back to Konoha?
I can't see how. He should give up of his revenge (destruction of Konoha) and submit to the command of HoKage.
Second is something that he will have to do, one way or the other. If not in the Leaf, then in some other hidden village anyway. No Kage will accept forming independent rebellious clan on his territory. So if Sasuke want to rebuild Uchiha clan, he will have to accept some authorities, sooner or later.
First is a bigger catch. Possible only if everything Madara sad was a lie, Sasuke finds that out and turns on him. Otherwise, Sasuke will strike Konoha by targeting elders, and from that moment noone could redeem his actions. Not even Naruto as new Hokage.