Past their prime Euro players can make good retirement money in the MLS, LOL. See: Beckham, Gerrard, Lampard, Pirlo, Villa, etc
Now don't kill me for this, but here is my reasoning. Ok She is 14 this month and he is 11.5. If they were to go pro before college (don't go there ) I have 4 years and 7 years before they are done with high school. If they can make 60k+ per diem as pro athletes that's better than what most people are getting in this job market. Decent living to play the game you love and be in supreme shape. Low on the professional scale. If they go overseas and play they may bump that income up another 10-25% depending on the exchange rate and standard pay. He is a keeper with the backing of coaches connected in the EPL. The Championship in England pays pretty damn good compared to the MLS.
If they can get more it only makes it sweeter. The leagues have time to grow the fan bases and $ investments. They look way better than I do so endorsements could always net more than the salary.
My idea is this - have them be the best they can be and ready to take advantage of the positive opportunities that come their way. Keep them out of the hands of the soul snatching crap coaches and have them grow, grow and grow.