I wouldn't take Nash back on this team, which hopefully comes as no surprise. But it's not because of the way he left (which was deplorable and I don't understand why he gets a pass from so many posters here). It's because he doesn't seem to be a very good player anymore. This may sound false, but I mean it when I say that's a shame.
My gripes with Nash are about his flakiness and I root against him because of it, but I don't want his career to be ruined or anything like that. I like to see him struggle and I've been glad he's nowhere to be seen in the playoffs... but it's getting a bit real now, and to read what a lot of other posters are saying about him, I'm starting to feel for the guy. He's a self-entitled idiot who doesn't understand the consequences of his actions, but you can't blame a guy completely for being a fool, you gotta have some sympathy, too.
Anyway, that's why I wouldn't want him back. Also I'd be afraid that he/the team would fall right back into the familiar routines like you do when you get back with an ex, and we do not need that around here.