Never say never I suppose in predicting what 18-22 year olds might do, but I agree that Carter/Miles will certainly stay & represent a key part of the future.
Miles started all the games I believe so zero room to complain. Carter logged what I would call big minutes & was inserted in countless critical situations. Both seemed to have the green light to shoot when they'd like & both had sets run for them to shoot. As true freshmen. Not saying it was unwarranted or there were better ways to spread the wealth, but barring major changes to this, I see no justification to leave.
While attrition is possible & seems wide spanning across NCAA hoops, I believe that just because it happened with WV before doesn't guarantee it'll always continue to happen. I'd think pondering leaving a program would be directly contingent on exactly what the better option is that's also worth sitting out an entire season for. Not simply a I'm leaving because there's competition at my position approach.
Some may look at being a part of this team that could do something special over the next two years as a real opportunity. Like a Gary Browne approach. Maybe Gary was the exception & not the rule. In any event, the Sweet 16, winning ball games & playing on national TV every week sounds nice to me.