Desantis/Youngkin would win over 350 EVs/+5 PV. That democrat ticket is one of the worst ones imaginable, only thing worse would be if you reverse it.
While I generally agree Youngkin and DeSantis would be favored, I think "candidate quality" isn't something that one can truly be confident of until the day of the election, and much of it is hindsight.
A hypothetical DeSantis/Youngkin ticket could have a ton of gaffes, and may struggle to unite the Republican Party whereas Harris is successfully able to rebrand herself a bit and Buttigieg becomes widely liked for being well-spoken.
Idk but people try to predict elections too narrowly so far out. The fact is there are a lot of unforeseen things that can and will happen over the next 2 years that will affect the race.
2022 would be a great example; immediately after 2020, people wrote off the House as being long gone for Dems and while Ds did ultiamtely lose it, it was very close.