Be careful what you wish for...

[Septua]

Trump and MAGA droned on and on about Biden's crumbling mental state, saying he should drop out of the election, resign immediately, etc, etc. Well, Biden graciously did just that and endorsed Kamala Harris to take his place.

Now, they're all frantic because Biden dropped out and endorsed Kamala to take his place.

[Metaphorical]

1. This also, of course, put the spotlight on Trump

The media is not asking the questions (of course they aren't) about whether Trump is too old, but having raised the issue, the GOP has now firmly planted the seed that Trump is not exactly a spring chicken either (nor is he in the best of health).

In my experience, MOST people aren't stupid, they're just lazy thinkers and don't investigate until they have to. However, once you've raised the issue of age and cognitive declines, people begin to ask questions.

[Walleye]

2. I think Joe had all these ducks in a row before he stepped aside

[Irish_Dem]

3. Of course everything was lined up beforehand.

You don't scrap Plan A until Plan B is in place.

The confirmation is that Plan B was rolled out perfectly.
This is not luck.