Well, as I said, I doubthe could do it but let us indulge put fantasies. If he managed it, he would cut away an important gateway, not the only one but important for Bohemia, gateway into Poland forcing a foot in the door into Poland. He will have weekend them since Krakow was, for example, one the most important salt mines at the time, sending it's salt all the way to Genova for trade. He would also, unfortunately, create a wedge between a Poland, pissed at the loss and powerful enough to have repelled him numerous times before he got help from Bohemia. And, talking of Bohemia, on the other side puff the wedge, an annoyed Bohemia who just lost an important piece of land and quite ready and willing to rearm from their formentioned lands inn Austria. If and that's a very big IF, he could defend against them, he would have opened a window into central Europe.