It'd be a bit funny if he found himself back in Dallas, but Dallas is in the running for Deron Williams so I'm sure if they aren't able to acquire him, I'm sure they'll make a play for Nash. He did mention in a recent interview, that he's more interested in joining a team that's able to compete for a championship but as a competitor he's more interested in beating the best then joining him but he also said he's going to evaluate all his options equally, so yeah, like you said it wouldn't be surprising he we see him on the Heat next season. It'd be really interesting to see what that team is like with a real point guard.