Trump was able to gather the hordes of weirdos in a way none of those other movements could. For whatever reason, he was an exceptionally powerful populist, and the other craven greed monsters want that power bad. It’s been shown that that magic doesn’t run off on them though and it seems to be flaking off trump very quickly these days.
There will always be another eventually, but it can’t be denied that Trump’s star is falling, and the Republicans have no one able to gather the hordes like trump could at the moment. If they lose their ass in November, it’s very possible that it takes them quite a while to regroup in any real way. Their penchant for infighting will slow things down.