As the EuroLeague grows, so will player salaries. Loads of money in Europe.
At some point, the best EuroLeague team will able to afford a couple of NBA-competitive salaries and a roster full of NBA minimum salaries.
All you need is a couple of near-star players - who get the high-competitive salaries - and a bunch of NBA-caliber players who get an NBA-minimum-like salary to play close to home...and the Euro team will be better than the lower NBA teams.