No, I have seen this idea presented but it has a very large flaw that people overlook.
The optics of Biden stepping down or being ousted are truly, immensely horrid.
The media has pressed very hard the idea that Biden is entirely fit, they have swept under the rug as best they can the idea he is not, literally millions of voters voted for him under that belief and -only- because of that belief and a distaste of Trump. It was the single hardest press by the media to ensure people took Biden seriously, it's the keystone to the lie the most important piece.
Him leaving early -destroys- that. It's a massive hole in the lie, unrecoverably bad. It will instantly make a lot of converts against the media, destroy any last vestiges of credibility even on the left, turn all sentiment to Kamala into outright hostility, and just generally nuke the administration from orbit. It's the big lie, the keystone. If it falls, everything falls. They -need- people to believe Biden is fit and healthy lest the moderates and even more center Democrats turn against them en masse. Which means he must serve a full term, he -has- to.