Sulla was corrupt and selfish in the regard that he only set up a dictatorship to server his own purposes and lifetime. Whoever says that Sulla cared about Rome is mistaken, he could care less as long as he go what he wanted. He was so rich and powerful no one could really touch him. He exterminated all obstacles in his way so that he could set up his own reforms and governments.
So in that regard I agree he was ruthless and could care less about Rome, and its future.
On the contrary, not much is known from history after he retired. Most men take a break so that they may live in peace. He left Rome in 78 B.C. and then lived in Southern Italy. According to Rome by M. Rostovtzeff, "There he lived as a private man, but not for long: within a year of his retirement he died."
In other words, your pushing it.