Right, Trump's supporters aren't being "tricked" into supporting him. They might be getting misled on a bunch of things, conspiracy theories, election lies etc., but generally, their basic support for Trump isn't based on them being fooled, or "stupid" or similar. For me the general sentiment goes back to when McCain snatched the mic out of that elderly woman's hand at the Town Hall during the 2008 campaign. She was accusing Obama of being "an Arab" or similar and McCain effectively "shushed" her on live TV.They're not morons. That's not why Trump has his appeal (though his "I love the poorly educated" comment was yuge in establishing his appeal). I was just about to add to my post and your reply, Farm Boy, gives me a good pretext for doing so.
One massive element of Trump's appeal, and he played it up constantly in the 2016 campaign, is that he's "not a politician." He ran not against Hillary but against Washington. In his "American carnage" inauguration speech, he calls out Republicans every bit as aggressively as Democrats.
Unless another celebrity parachutes in, all the Rs will be able to give their voters in upcoming cycles will be more of those "politicians" that Trump has taught his fanboyz to hate. They will actively withhold their vote from the R party for only giving them such.
The Republican party had been doing that to their most loyal base of support for years, whereas Trump doesn't do that. Trump does the opposite. Trump empowers the base and gives voice to things that they felt they had been "shushed" on and ignored about for years, decades even. And its not just prejudice, bigotry etc., there are plenty of economic and social issues where Trump aired things out. On so many issues for the base, he made them feel like they were free to air it out without being told that it was taboo or they could not talk about it, or that it was not important.
Thinking about it... I'm not convinced that Trump's departure from the political stage would reverse the trend of his movement though. Sure people might not be satisfied with some other politician trying to take up his mantle as a POTUS candidate, but on the Congressional level, candidates are getting voted into office on the Trump program, without actually being Trump. There's also the possibility that some other candidate will emerge, who we aren't yet familiar with, to pick up where Trump left off. It's essentially impossible for anyone to pick up Trump's mantle right now, because Trump is still wearing it. However, Trump leaving the stage will create a vacuum, that will be filled, by something/someone, even if it's currently unclear who it would be or how that might look.