Anyone notice the new pet at the Bing? The cat? You know, nine lives and all that. Anyway, when Tony asks about Phil, the guy from New York tells Tony,"You gotta' do what you gotta' do". Then, with Phil out, it would make no sense for another hit.
Anyway to have Tony go out with a bang would be so 70's.
Tony's life as he knows it is ending.
His old gang almost all gone. His family can move on to their new careers while Tony faces certain prison with indictments and a turncoat testifying.
He would probably welcome getting whacked now as the best way out.