Nobody in office has mentioned the 25th.
Dims don’t want Harris out front. It would be a complete DISASTER for them prior to the mid terms.
If Biden has dementia (as has seemed very likely since last year), then using the 25th amendment makes no sense since he won't get better--just have him resign. Heck, they could put a letter of resignation in front of him, tell him that it's a bill of attainder against Trump, and he would sign it no questions asked.
Having the Giggler in Chief as President would mean having to put a lot more effort into vote fraud in 2022.