If Severus survives the war (assuming that the good guys will win), in the immediate aftermath his life will be hell. Oh, he may be pardoned eventually, or even exonerated. He might manage to hide out until the charges are dropped. But there are going to be rough times. Nothing he can't handle; his life has always been pretty miserable. But. What if there aren't? How would Severus Snape respond to a world in which things go his way?