Tony has always looked out for number one - no matter what. If he is indicted, which is likely with Carlo's flip, I can see his defense team setting up a "Silvio was the real boss" scenario. With Silvio in the coma or dead, what a perfect defense to exonorate Tony Soprano thus he "gets away with it" yet again! Remember,the burden of proof is on the Feds. Nobody is alive to back up Carlo's testimony, all the other informants are "gone"...Big Pussy, Adriana, Jack Mazzarone, etc..Reasonable doubt can be easily created by a good defense team.