Goran is always wrong. He also predicted Italy to win the Euro 2012 right before the final and then they lost 4-0.
As for Wilander, I don't think he predicted Roger to win Wimbledon, but he predicted Djokovic for the USO last year and the Aussie Open. I think it's also safe to assume that no sane person would bet against Rafa on clay.
At the end of the day these are just predictions though. I won't hold my breath until Andy actually wins a slam. Until then he won't be the favourite, at least not in my mind, entering any
tournament where one of the other 3 is playing. That said, I hope he proves me wrong this time.