Would be the most logical thing for the democrats to do, she should have been president outright now anyway. Anyone would have won , they just picked the worst one to win it.
I mean the story mentioned how he keeps losing track of what he is saying, losing balance , falling asleep , not being his usual self etc.
Even if he is president for his full term I wouldn't call it baseless, you can clearly see from even my completely outside perspective he isn't the strong leader that he may have been 10 years ago, which his age would absolutely play a factor into.