The game has changed and to expect no one in the world of college basketball to recruit the one and dones is a fantasy.
Since they can't play in the NBA, they will play somewhere. Duke is recruiting the best players available.
So it may surprise you that I agree with you that the college game is being destroyed. It is sad to see and I admit I no longer follow the game like I used to because there is little stability in the game. This is why a George Mason can stumble into a final four because they have a veteran team competing against many younger teams.
However, I certainly don't blame Coach K for this. He did not make the rules. Why shouldn't a coach want to recruit the best players available? I have read the NCAA would like the NBA to change the rules that you have to be out of high school for two years, but that will never happen.
As you know, many of these players do not grow up in the best environment. I completely understand why these players want to play in the NBA as quick as possible. You would, too. You would do the same thing.
Greatest thing that ever happened to Mike K. was Dean Smith retiring. His old nemesis beat him like a drum for the almost 20 years they coached against each other, retiring with a 24-14 record against him.