All this consternation goes away if you replace Kamala with Newsome as the VP nod.
You get assurance and comfort that if Biden croaks, you get the guy who was talked out of running against an incumbant in 2024 and who is the 2028 odds on favorite anyways.
You get assurance and comfort that you have a strong politician as "the hand" of the feeble old Biden, and best case scenario in the later years-- say 2026-2027 at his stage of seemingly rapid slowing down-- you are comfortable that the VP is running things.
You get Newsome with "experience" by being a shadow president, potentially, for 2028 and get a gray-area of an incumbancy bump you can use
You get to avoid any blowback from the Dem base who would be upset about "yet another white, straight man of priv" getting the nomination
It just makes too much political engineering sense.
The downside is you do have to deal with the blowback in the short term for sidelining Kamala and puting her out to pasture for Newsome which could come across horribly to some of the base who thinks its race-based, gender-based discrimination, lack of representation, and otherwise. But I think, fair or unfair, Kamala doesn't have the personal brand as super competent and accomplished in her limited time (unlike, say Mayor Pete who did a great job of actually tackling issues and communicating his wins on TV for everyone to know he's actually doing stuff), that you can for sure say she's a better politician than Newsome.