I think that if he succeeded he would later also be killed just as a matter of principle, and because he was disposable.
No question about that. Sollozzo was a means to an end. If Barzini and Tattaglia succeeded in their was against the Corleones, Sollozzo would have eventually become expendable.
"I got news for you. If it wasn't for the toilet, there would be no books." --- George Costanza.
