I don't care about tickets. Only the name at the top matters.
I am skeptical of Newsom, because Calheel doesn't like him. Calheel should be firmly in Newsom's base. If Newsom has a chance, it's because the Calheels of the world support him. Now, Calheel is only one guy, and maybe all the other Calheels would support him. But at this point I have very limited data, and this anecdotal data point carries enough weight for now.
Note: I said I was skeptical. I don't have an opinion that he can't do well, but I'm not enthusiastic about him either at this point. The problem is that he won't be able to win an open D primary just by shitposting about Trump. I don't think he's an empty suit -- far from it -- but he has some downsides. his position on the CA wealth tax will hurt him, even though it's probably the right thing to do as governor.
We have a lot of imperfect candidates at this point. That's not surprising, because it's far out. But we shouldn't expect an Obama to ride in. It's sure looking like the electoral theory -- which will probably prevail -- is that the other guy is a disaster. And if the other guy is Vance, it will be a historically weak candidate.