I don't think Stan will progress much further, but he'll hold, for a while. He's most likely reached his limit and will have a solid year, bolstered by the progress he's made last year and this.
I wouldn't expect him to beat Rafa Nadal again this year, and certainly not on clay. But I'm hoping he brings his attitude and desire to the rest of the season. I doubt very much he'll rest on his laurels, but Herios asks a good question: how will he cope with all the attention?
Plus, it's to be hoped that his performance in Oz - and that of Dimitrov - spur others into thinking, "hey, that could be me!"