Is College Basketball a Freshman's Game?

It seems like in today's college basketball, freshman are taking over the sport. I mean has this game become a freshman-dominate sport? For a great example, look at the University of Kentucky's starting five(John Wall, DeMarcus Cousins, Eric Bledsoe, Patrick Patterson, and Darius Miller). They start three freshman(Wall, Cousins, and Bledsoe)and will probably become the number one team in the nation. They have respectively the best player in basketball(Wall), who isn't a junior or senior, but a freshman. You can look around the U.S. universities and see other uprising players who are impacting their team; they are mostly freshman. It seems rare to have a player on your team who stays all four years. Sure, there will always be a few out there who are devoted to getting a degree like Tyler Hansbrough and Sherron Collins, but they come rare. I mean I think its uncommon to see a player stay all four years, unless they haven't played that much in the previous years and were sitting on the bench for their freshman and sophomore year. Other great examples include as followed:Xavier Henry(Kansas), Derrick Favors(Georgia Tech), Lance Stephenson(Cincinnati), Avery Bradley(Texas), and Kenny Boynton(Florida). These are just a few names but if you were to watch them play, you would understand just how dominate they are. I am not saying it is a bad thing that they are good. I just think the sport would be great if they stayed for two years or more. I'm glad they have the rule that makes them come to college. How great would it have been if Lebron James came to college for a year? We will never know. I think college basketball should be more than one-and-done!