"Very important after the Commission trial, the old and respected bosses were replaced by younger and arrogant bosses but above all greedy,trigger happy and blood thirsty."

That may be true with many of the families, but not with the genovese family. Gigante was still in charge, yet peter savino still became a turncoat. That tells me that it couldn't only be internal problems. No doubt internal factors such as bad bosses played a role, but I think that the new tools the government had forged along with great public support against OC in the 80s and 90s due to corruption, drug problems, etc the mobsters saw that the writing was on the wall. It has to be intimidating, even to mobsters, when the government can bug a car and use the intelligence gained to put someone away for 100 years.