As someone who has never followed soccer, why did vidovich leave for Pitt?
He didn't, at least not directly.
It should probably also be noted that our program was in a bit of a lull. Jay's final few years definitely weren't bad, but there was a feeling of stagnation; his last five years we had a cumulative record of 47-34-19 combined with early ACC/NCAA exits, which is... fine, but when it's bookended by a 79-11-10 run from 2006-2009 and then Bobby's 103-17-12 mark over the last six years, it really does stand out.
One of the legendary college coaches, Caleb Porter of Akron, gets offered the Portland Timbers head coaching position in MLS, and he asks Jay to come help as the Portland Timbers 2 coach (essentially their minor league affiliate). I want to say that there was some friction between Jay and Wellman over the years, and I remember hearing that it was about the salary of the assistant coaches, that was something of a wedge issue and helped push him out the door. It's also pretty rare for college coaches to get the opportunity to move up to the pro ranks, so from a professional developmental standpoint it sorta made sense I guess? Anyway, he spent one year there and hated it. The following year Pitt was looking to make a significant investment in its moribund soccer programs (both men and women), and they made Jay an offer to be one of the highest paid coaches in college soccer. (They also hired away Notre Dame's highly successful women's coach; ND was a women's powerhouse at that point and hasn't really recovered.) Jay's turned the program completely around in five years, and keep in mind that their results this year have come without their projected best player, who was kicked off the team in the fall for undisclosed reasons.
All told, I think most Wake people are happy for him; the parting wasn't particularly acrimonious for the fans, and given the lull we were in a change in direction seems like a benefit to both parties here. He's also a pretty congenial guy generally. If there's a team to cheer for as a secondary rooting interest, I think Pitt's as good as anyone.