I think the question is, “did leaving the Big East hurt basketball?” The answer is undoubtedly “yes”, along with many other contributing factors.
Did we have to leave the Big East? The answer is undoubtedly “yes” for many reasons.
Two things can be true. We pine for the BE because “those were the days”. Can we be relevant again in the ACC? Remains to be seen.
I, myself, as a serious fan, am very hopeful. However, if I’m honest, I don’t think the future bodes well, for various reasons. I hope that is not the case.