European soccer leagues are playing many preseason games in the us, often in front of larger crowds than they would get for a preseason game at home, but nobody is expecting Manchester United to relocate to Manchester, Ct.
It's not gonna happen. They will put 1 probably 2 teams in Europe full time very soon, they aren't making a bunch of teams move their preseason over there. Most of the teams have deals with local colleges in there area anyway which locks them in. So it would be difficult to impossible to organize and it's just not gonna happen