If Wiggins goes to UNC it'll be another very talented top 5-8 UNC team and IMO nothing more. The experience and talent at Michigan State, Kentucky, Louisville, and Duke will put them in a class by themselves. Duke and UK are teams to beat next year...with MSU really on their heels. Heck...UNC could be 3rd in the conferences with CJ Fair announcing his return. Not a championship team for Roy though and IMO it's not how Roy wins. He typically wins by getting superstars to stay in college. His chance to win it all agin was with Barnes, Henson etc...he HAS to have the most talented player at every position to win. He'll have that at one position if he gets Wiggins but the rest of those guys are role players on a championship squad.
Just hard to win a title when two coaches like K and Cal both have possibly their most talented teams in last decade. I think the Jay Williams team is most talented team K had (this one rivals that IMO). This will clearly be most talented team Cal has ever had. Same COULD be said for Izzo's team this year.
What experience does Duke, Kentucky, and Louisville have. All the teams that you mentioned lost more than Carolina lost. In my opinion, the only classes out of the four you mentioned that have a better recruiting class than UNC are UK and Duke and Duke's depends on if Wiggins commits to UNC or not. I have a feeling that you haven't seen Wiggins play or are underestimating his ability. The kid is just flat out dominant, he has dominated everyone he has ever played and I don't expect it to be any different at the college level.
A Carolina team with Wiggins, Hairston, Paige, Hicks and McAdoo with great role players in Kennedy Meeks, Brice Johnson, Nate Britt, and Leslie McDonald accompanied by great depth players in Desmond Hubert, Joel James, J.P. Tokoto, Luke Davis, and Jackson Simmons is a top five team and a contender for the NCAA Championship; it's simple as that.