The 25th Amendment was created primarily to deal with secession in the wake of a President resigning from office, with the 25-4 there primarily for situations where the President was physically unable to hold the office (for instance, due to cancer or a heart attack). In all honesty, Biden probably should have voluntarily resigned and let Kamala Harris become president under the 25th Amendment when he was diagnosed with cancer. As an amendment for dealing with the current situation, it's worthless - it's easier to impeach Trump and remove him from office.
Now, I think what the GOP is hoping is that, if they end up losing control over Congress (not a foregone conclusion but possible) that the Dems will impeach him and enough GOP will vote with them to put him away for good. Vance and Rubio become POTUS and VPOTUS, and the bodies get buried before they lose the presidency in 2028.
I also think that there's a certain amount of wishful thinking among the GOP regulars that Trump keels over on the golf course near Mara Logo. This would be the best case scenario for them - kind of like with Reagan, a dead Trump can always be turned into a MAGA martyr.
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