Re: Laker fans;
Kobe, and Pau for LeBron, Wade, and Bosh would work...
Seriously though logically speaking you do the trade because LeBron is not only better than Kobe is right now, but he will be better than Kobe currently is for at least another few years. Anytime you can get two prime superstars on the same team you do it logically speaking.
The fan backlash would be crazy though, and that is the reason that in real life it would never happen from the Lakers end, and from the Heat end Riley would just laugh at Mitch for even calling.
I've always said, and got flamed for it, that when LeBron was a Cavalier if there was a trade that made the team better i would absolutely have done it. This was during his MVP seasons, and fans weren't very receptive to that idea.
Of course it would have been hard to improve the Cavs by trading LeBron, it would have had to be something like Chris Paul and Roy Hibbert for LeBron, which would not have happened lol.