What’s the most credible argument that the current president can’t run for re-election yet can continue with the world’s toughest job for another 100 days?

under this model, its more about biden's trajectory, ie he will be capable until election day but not capable of being president for another term, thus he can stay as president but can't run again

China invades Tawain on September 1st. Biden has to make the calls. Can’t remember the name of his secretary of defense.

Add in Russia does something crazy 2 days later, and then North Korea goes off the rails two days later.  Each time it’s a 3:30 am wake up call with decisions needed in 2 min or less for Biden.  What are the odds he knows what is happening?  

Nobody that age is fit for this job.

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Correct. Resign and make Kamala president. I’m not as fan of hers, but would much prefer someone not in serious cognitive decline.

This thought right here is probably the Dems' best offense at winning now against Trump. 
It's kinda cannibalistic but start a push for constitutional amendment regarding maximum age to be POTUS based on mistakes by Biden and Trump in recent years.