I honestly think Don Jr. will run in 2028.
I am praying that Trump Sr. makes it into his late 80's. This way if Don Jr. runs. Don Sr. could be apart of it in some way.
I read somewhere that Don Jr isn't ruling it out.
Trump just needs someone who is loyal to MAGA and wouldn't backstab him for VP.
I've said this to my husband while Trump was still President, that Jr will run for President after his father.