Warren is only 3 years younger than Trump. AOC is a poster child for GQP fundraising boogymen. It would be cool, but I don’t see it happening. I’d enjoy being wrong about that, because either one would destroy Vance in a debate.
Shapiro is a safe choice. The Lieutenant Gov is also a Democrat, unlike North Carolina (cited as one reason Cooper didn’t want the job) and Davis would be the first black governor of Pennsylvania. Shapiro is more of a centrist, but his politics are really shaped by the demographics of Pennsylvania. He would likely pivot on some issues like fracking or unions, but his support of Israel is not likely to change and it is going to be divisive.