I think you are making a wrong comparison. College ball is not equal to "street talent" for one reason - and that is age. It would be very difficult for an entire team of 18-21 year olds to beat a seasoned NBA team. However, your street talent would consist of guys from 18-40 years old, some probably former semi-pro or college talent.
In addition, considering the recent deluge or high school players into the NBA, many NBA games look just like a pick-up game, with hot-shot behind the back passes that end up in the fourth row. You have probably dozens of NBA players who each have less than four or five years experience of organized ball on a competitive level. There is no doubt in my mind that an organized team of guys in their late 20's and early 30's could beat an NBA team, especially if the refs are going to call it their way.
The US Olympic team was made up of all college ball players from different teams who had played with one another as a team only enough to be called the 'US Olympic Team', and the street-hustlers were all well-known to each other from blacktop hustling.
I can't remember the final score, but it was a huge blowout in favor of the US Olympic team; The gap was something up around 75 points.
The players for the US team included Patrick Ewing, Chris Mullen, Sam Perkins, Wayman Tisdale, and an young unknown player named Michael Jordan.
The most crooked ref in the world couldn't have saved the ghetto-ballers from that kind of humiliation.