An Important (If Overlooked) Factor in The NBA vs. Europe Argument

For all the recent talk about how European basketball might be in a position to challenge the NBA, there is a major factor which no one seems to have touched on, and that's the player's union.  Mike DeCourcy hit on a parallel theme when he talked about how Brandon Jennings new Italian team is pretty irregular about paychecks.  For all the talk about euros and so on, NBA players have a very strong union and some real guarantees.  We don't know what rights players have in Europe, but we're pretty sure they're not as strong.