I thought Pence was a fine pick back in 2016. He did bring balance, had Washington experience, etc.
If Trump runs in 2024, Pence will NOT be the running mate. And if Trump does not run in 2024, there is a long list of folks that will be picked over Pence. And who knows, maybe Jeb will make another stab at it. His desire has not been vacated, I am sure.