And we're in the midst of a huge boom period for Americans in Europe, with young Americans playing regularly for perennial Champions League teams Dortmund, Barcelona, Chelsea, Juventus, and Leipzig, a handful of starters on quality teams behind them, and major European teams spending more and more resources scouting American prospects.
Player quality is the main driver of international success: Belgium went from 57th-ranked in 2010 to 1st-ranked in 2015 (yes, FIFA rankings are bad, but they point to something real) not because of some change in scheduling philosophy but because they had a bunch of great players in 2015.