My opinion on Thornton is he took too many boneheaded shots, wasn't very smart with the ball at times and didn't find the right man. But he was a freshman and I think he has the talent and is on the right team to improve on those things.
I think that there are two problems that are revealing themselves right now. One, we expected too much from him and if the expectations weren't so high, I don't think we would be so harsh on him and we would have a lot more patience with him as he develops. And that is not his fault.
Two, it appears that he believes he is better than he is. But this part is purely speculative and based off of 3rd, 4th, 5th party hearsay. But if it is true, his attitude needs to change in order for him to improve, or he should just go where he thinks he will be happy.
In the end, we can all agree that between Frank Jackson, Luke Kennard and Grayson Allen, Duke will have capable ball handlers and will have a great season next year even without Thornton. But I also think we're downplaying what kind of a loss it would be for the team.
All said and done, GO DUKE! on to next year with whoever will be on the roster!