I wouldn't rule out him becoming USA's manager at all.
They're already in the next world cup as the hosts, and as the hosts they will probably want some huge name in football coming in to build the hype, meaning they would probably pay him great money. Its not quite as intense as the Germany job or a big club job, you're not gonna be getting slated in major newspapers every day.
So if he does still want to manage but in a slightly more relaxing role while earning some dough, it's a good job. There's no worry about qualifying, so he can just spend the next couple of years getting paid to live in a sunny part of USA and getting a team together and see what they can do in the World Cup without expectations to win it.