Tough to say. He wanted to distance himself from the family before he even met Kay (he didn't meet her until after he got out of the Marines), but then of course everything happened.

I think that he would have even without her in his life, however I think if Appolonia had lived then he would have fully embraced being a Mafioso because A) She already knew he was (or at least suspected it), and B) She would have been like Mama Corleone and known not to ask questions or be a bitch to him.