re: 42% of republicans want trump primaried in 2020, 82% of 18-24 republicans want primary

Unless something major happens in the next couple of years no candidate worth voting for (Cruz, Rand, etc.) is gonna take a chance on a primary challenge versus Trump. Lose that and it's over for you as far as Presidential aspirations. They're more likely to bide their time until 2024.

You'll end up with Kasich or some shite like that who would get walloped.