Well, it depends on how you got your name out there. Sure, with the current primary, Trump is going to squash a lot of these guys, but if they have a good showing at a debate, it gets their name out there for the next election. Trump will be term limited, so they’ll have to find someone new, and “Hey, Bob Noname came across pretty well last time. He wasn’t ‘ready for the job’ then, but 2028 is another matter…”
You can’t win an election if people don’t know who you are, so step one is looking decent in a high profile event. And let’s face it, with another clown car primary coming down the pipes, it won’t be hard to come across as “The Sensible One”, even if you lose this round.