Trump is what 74? A lot can happen health wise to a 74-year-old. A VP particularly one who assumes power through emergency presidential succession as a minimum should be capable of carrying on the policies of the one who brought him to the dance. Any and all VP considerations should have that in mind. Failure to do so would be irresponsible and frivolous!
I guess your goal is to kill MAGA after Trump leaves office. The VP whoever it is will be anointed rightly or wrongly as the MAGA successor. Pence could have been, but events showed he was a poor choice as VP. DeSantis could have been, but he chose poorly. (Maybe he can redeem himself? Getting out of the race now finishing his governorship campaigning with Trump could make a difference!)
The true bottom line unless we’re just Trump personality cult worshippers Trump is not important. The MAGA principles are! Trump is the current vehicle to carry them. They must continue past Trump. RFK Jr is the polar opposite of those principles!
So yes, by all means choose RFK Jr if you want an authoritarian Marxist a heartbeat from the presidency.
Trump turns 78 this June.
Politics makes strange bedfellows.