The obsessive focus on Trump's biggest fans as being the only voters who matter has always been ridiculous, especially as once you stop being a Trump fan you are no longer part of the set who matters. Trump could have one fan left in the country and 1200 reporters would follow him around, reporting on the Trump Voter.
But longtime readers remember that the previous Worst Preznit Ever, the guy people remember fondly now, actually did see his approval rating sink into the 20s.