If Biden were willing to step aside willingly, he would have done it already. Just like a lot of elderly people with serious cognitive decline, he is stubborn, and digging in. A forced withdrawal will require seriously damaging him, and many of the options would damage the party in general.
That doesn’t mean it won’t happen. Putting off the deed allows the party to rip the band-aid off at the convention, dumping Harris and installing Newsom. But that could get bloody.
There’s always the “Carnahan Plan”. Biden dies suddenly in October, and the DNC announces the poor widow Jill will replace him should Joe win the election. This might actually be the best hope the Dems have.
Jill will replace him either at or before the convention, cutting off Harris at the pass....................