The question is "Will they be able to continue recruiting players that can keep them at this high level?" I have a feeling they will because they aren't likely to recruit the same players Duke, UNC, and SU will. Given their style of play, they will likely look for those players that stay in the program and develop over time, making for teams dominated by upperclassmen.
This ^^^^. While you certainly need talent to compete with the top of the ACC (and I'd add Louisville to your list), we don't recruit with the same strategy as the elite programs in the ACC or the nation. I gave some Heel friends a hard time this year when they told me "just wait until we get the 3 top 25 players next year to add to what we already have...then you'll REALLY see Roy's system at work." My argument was, if the system is only successful when it's loaded with 5 star talent, is it really a system?
We've had 8 guys this year average at least 10 minutes per game. Using Rivals as the ranking reference, here's where those players stacked up before arriving at UVa...
1. Brogdon - #104/4 star (#107 was a 3 star, so low 4)
2. Perrantes - Unranked/3 star
3. Harris - #119/3 star
4. Mitchell - Unranked/3 star
5. Anderson - 4 star/#35
6. Gill - #144/3 star
7. Tobey - #76/4 star
8. Atkins - Unranked/3 star
Duke had 4 guys this year ranked higher than anyone on our roster, and 9 guys ranked higher than our #2 (Tobey). Carolina was pretty close with like 8 guys higher than our #2.
Tony gets guys who buy into defense, the team concept, and who are more worried about winning than padding their NBA resume. While losing Harris & Mitchell will certainly be felt, we've got Anderson & Gill ready to step in and play starter minutes next year, with some solid (not superstar, but solid) freshmen ready to play reserve minutes. 5 of the 8 above (Atkins being the only exception, he's a JR) are either FR or SO. One guy not even mentioned above, Evan Nolte, is a sophomore and given us some great minutes off the bench in the NCAA tourney so far as well.
Our recruiting star numbers aren't likely to blow you away on Signing Day...that said, I'd very surprised if there aren't 5 teams at the top of the ACC heap for the foreseeable future instead of just the 4 who have been elite for awhile.