This seems like a high risk move. Also doesn't look great that Mexico went down the path first and then rejected him.
He runs a very specific system. Could it work with limited training time/games? We do have the type of players that could make it work, but it could backfire. I also wonder if the players' teams will Bielsa running them so hard when they are away from the team. Bad enough guys get injured on breaks, but even healthy ones may come back in need of rest. That said, he could make us fun to watch.
I don't think I'd want Mourinho manages my club, but he could be great for the US. He wouldn't take crap and he'd have a finite period of time so hopefully he wouldn't blow up before the World Cup.