Correct, I think the good players from foreign countries will be more apt to play full time, as its advantageous vs their real world job. As more players enter, the tables will tighten and good players will be forced to play lower limits if they want to remain profitable, at which point it will not be favorable for many pros in the developed nations to play.

I would be fine playing US players only. I prefer to play with whichever players are most +EV for me. I see no moral issues. As such, i prefer to play with an average USA player over an average person from a third world country because the average USA player (per my assumptions) will have more disaposable income and tend to be less inteligent.