i don't think the league is the problem (in NT sense)....Serbia,Croatia,Slovakia, Czechs,Sweden,Denmark etc etc....with historically very poor leagues produce quality footballers.....note they all have smaller populations than Greece too...
Belgium produced this current crop of 'golden generation' footballers with an average league...
The SL will improve in the next few years....a debt free PAOK + PAO will improve, AEK and Iraklis returning in a few months...16 team league......(osfp,aek,pao,paok, iraklis, tripolis, atromitos, xanthi,) that's half the league with either strong administration/infrastructure or historical strong support....Long way to go...But it's a start....
Aris,AEL are not too far away either...