Unfortunately, its apparent that people view such things through their own preconceptions.
Those who love the NBA, think it was wonderful and sure to boost the sport.
Those with no interest in the NBA, or who thought it showcased everything that's wrong with America, have a more sanguine outlook.
It's honestly hard to say. I'm sure there are those who despite not actively following American sport, would still buy into the almost religious fervour that surrounds Jordan and his ilk, or at least appreciate his demigod status, and for those it may (re)ignite an interest. Of those, the ones who already follow say AFL, may become convinced now that NBL is a "real sport."
BUT how many such people are there?
It really depends on what people's reasons are for not appreciating NBL.
Personally, I still appreciate that many Americans died defending Australia, that our entire defence is predicated on the ANZUS treaty and the US Navy, and America remains almost our only trade ally. Yet I am amazed about the amount of anti-American vitriol I read almost every day. And this is relevant, because one of the criticisms I constantly here from AL & NRL fans, is that Basketball is "Too American".
So for those, I don't expect the series had a positive impact.