Gotti definitely didn't completely get away with it. They attempted to whack him but took out his number 2. Bobby manna was lifed off for conspiracy to murder him and gene right? Gigante the most powerful ordered the hit. Apparently due to all the media and people around him they couldn't get to him which seems right. The 2 most powerful families were out to get him for quite a whole before it seemed unfeesible and counterproductive. Then they had a sit down an moved on. Bobby manna was enough of a hit for him on a matter of another family.