I think you mean me (maybe others too, but I'll speak for myself).
I think Trump did so well in this election (and 2016) with a large dose of 'cult of the personality' more than any populism. As the article you quote says, he all but gave up campaigning on any policy in the final days. Instead he was relying on the hero worship he's cultivated and demanded. For the Republican Party to reproduce that they need another Trump more than they need some form of conservative populism which didn't really show itself in his administration and its policy.
For a significant proportion of his votes (ignoring RP voters who would vote for a donkey wearing a red rosette) they weren't voting for particularly populist ideas against the elite (ironically ideas, if they were there, that were put up by a member of an elite) - they were (to paraphrase a Tea Party congressman from 2016, but even more relevant to now) "voting for the craziest son of a bitch in the race - and Trump won Best in Class".
The most common thread I've seen in Trump's supporters language hasn't been about policy - it's been "he speaks our language". They like his style, his personality. I think populist ideas come second to this and I'm not even sure it's a close race.
That's why I think Trumpism, without Trump, or another Trump-like, could melt away.