I don't know that he's a great fit for either the Lakers or Heat. Both those teams need point guards who can defend and shoot three pointers. That's not his game.
I guess if he wanted to go somewhere as a backup. But I don't think he sees himself as a backup yet.
But yeah, I'm not sure why he'd want to come back to Portland. He doesn't seem to have much love for Nate/management, and if he came back Nate would probably bench him in favor of Felton's three point shooting.
I'm trying to think of an elite team that could really use him well, and I'm kind of drawing a blank. I guess that's also why he was available last time when we acquired him. When you talk about contenders, it seems like your PG better be really damned good (Rose, Westbrook, Parker) or a reliable perimeter shooting role player (Kidd, Conley, Nelson, Bibby) who can spread the floor for stars that generate most of the offense.
Miller isn't really either. So I kind of expect him to go to some 50 win type of team where he'll definitely help, but not really push the team to a contending level.