If Biden was in better shape I'd agree but he isn't. I would have voted for him if I had voting rights in the US, don't get me wrong, but he's still a poor choice for president. So there are plenty of scenarios where he isn't a candidate for a second term, I'm pretty sure at some point he was even saying that he wouldn't be a candidate for another term. I could see him resigning after a couple of years, once he has put the country back on the right track, giving Kamala one year to preside, and one year to campaign.
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Biden's 80th birthday is in just on two years time - were he to resign at that time it would give Kamala Harris two years as President to establish herself in the minds of the public as a viable President and she could still run for two terms (enabling her to serve as President for ten years - in much the same way Mackenzie Allen once did  )