It is the party of trump after all. It looks like Idaho will not even have an election, but will merely "proclaim" trump won the nomination. Several other states might follow suit.
Sooner or later, trump will die, or far less likely, serve a second term, but before that, I assume he will just run over and over again. That might mean that DeSantis will have to wait later than 2028.
And even then, the trumpers will remember he opposed their false god.
DeSantis is 32 years younger than trump, so will assumably be alive (an average of) 32 years after trump. That gives him plenty of chances.
But this might be DeSantis' time. trump will be 78 years old at the next election, and in incredibly bad health after a lifetime of drug abuse. There is a real chance he will die over the next year and a half. If so, it might be DeSantis' time to get the nomination.