It is not absurd, and the "preference cascade" may already have begun.
Remember when Obama abruptly flew to Washington during the first days of his Martha's Vineyard vacation? It's still a mystery as to why he did this. Perhaps there was a meeting in which prominent Democrats asked him to a)start to deal with ISIS, and b)back off the immigration amnesty issue?
He is destoying the party, clearly, maybe it took them this long to realize it. At any rate, if I'm right and such a meeting occurred, then it's just a matter of time before he's asked to contract some mysterious illness that won't permit him to continue in office.
Should a (forced) resignation ever occur, you’re right, the reason would be due to a “health issue”. We would hear some BS like “he’s exhausted from running the country and needs restorative care”. lol
But this still presents a big problem for Dems. Crazy Old Joe would be next in line. And he’s an outright lunatic.