Only if the college All-Star team had about 6 mos of playing games together and had an offensive and defensive system in place.  They would also need a team of coaches to work them and define their roles.  After doing all of this, they would still only be as good as those NBA teams that have some of the worst records in the league.  They would likely still get beat in close games to a team like the Atlanta Hawks.  The reason is that professional teams are comprised of full grown men that do this for a living.  They are very physical and have played at this level for a number of years.  They make adjustments better and they know how to isolate another teams weakness.  However if the college All-star team was picked with role players in mind and was assembled as a true team, not just a bunch of scorers.  Then it wouldn't suprise me if they were able to win a handful of games over the course of an NBA season.  Usually in the NBA it takes a rookie player 1 year before they really get an understanding of how teams are defending him and what he can do to gain an advantage to help his team win.  Most rookies don't know where they are supposed to be on the floor and end up standing around watching the veterans.  There are a lot of great college players that played only one or two seasons in the NBA and then lost their jobs to another player.