ziggy,
If we were to call the ABA's quality "inferior" - which I wouldn't do - then, yes.
And keep this in mind, for those folks who say, "It's all about the money": It's *NOT* all about the money. The best of the best want to win on ALL fronts - money, fame, recognition, place in history. UNTIL Europe is in the market for Duncan, Garnett, James, and Bryant, the NBA will be the preferred destination for the top talent - even if they have to sacrifice a little money.
When Europe *IS* in the market for Duncan, Garnett, James, and Bryant, *THEN* it'll be an NBA/ABA scenario.