First...how many traditional powerhouses have changed leagues? All this conference movement is a pretty new thing. Louisville came into the Big East, and were one of the best programs their entire time there.
Let's not forget that we started 25-0 and were 12-0 in conference play in our first year in the ACC. I think we'll be fine...we had a semi-whiff of a class(I like Roberson but he wasn't as good early on as advertised and he's the only one left) and some early entries that hurt us. For example, absolutely nobody projected Ennis to be one and done until around the time he made the half court shot. If we had him last year, we're a 25 win team that wins 12-13 ACC games. We're still recruiting well despite the sanctions.
Duke's recruiting is in another stratosphere right now(it's them and Kentucky who are way above everyone else), but other than that we'll be right there with anyone going forward in the next few years. I think Louisville and UNC will both be better than us in certain years, and we'll be better than them in certain years...Virginia should continue to be tough while Bennett is there, but I think we will get to where we'll out-talent them at times in the coming years.
It's a difficult league but it's not tougher than the Big East was after Louisville, Marquette, and Cincinatti joined, when Villanova was at an all time high, UConn, Georgetown, ND, Pitt, etc were all good-very good. We had a little dip for a few years there too(due to an overrated 2004 class and complete whiff of a 2005 class), but we came back and won the league a couple times(2010, 2012) while playing in an absolutely brutal league.