Trent isn't going to go play in Europe. If he doesn't have some teams tell him they will take him in the first round he will stay another year. If they do tell him they will take him then he will get drafted.
As for any comparison between Trent and Miles that is just stupid. The two players are in completely different classes. Its like saying Burgess would be able to fill in for Cummard. If Trent is gone next year teams will game plan around Lee and that will reduce his effectiveness. With no other great players (excepte Tavernari from time to time) BYU will be a weaker team next year. I understand why people get frustrated with Trent but don't let that frustration cloud your vision as to how important he is to the team.