I really don’t think he’ll run for governor. He doesn’t want to lose any prestige in the state where he was “America’s mayor”.
I can't tell if you are being funny, or if you are trying to make a serious point, so I will answer your post as if it were the latter. If you are mocking the title "America's Mayor," have at it. But be aware that it was the liberal press who awarded it to him, not friends of Rudy, or Republican operatives. In France, I remember, they were calling him "Rudy the Rock" after 9/11. And he deserved it. I you don't remember him doing a superhuman job of holding the city together, and indeed, easing the fears of an entire nation in the first few weeks after the attack, then your long term memory sucks.
Meanwhile, if you honestly don't think he's running, you're in pretty small company. Everyone who pays attention to NY politics (including a guy I know named Rudy Giuliani) is postive he will run. The only thing that would keep him out is if Andrew Cuomo runs, in which case Giuliani would have zero chance of winning.