They'll probably bitch about Trump the same way people today bitch about Nixon and Reagan. That is, to use comparisons to him as a weapon to bludgeon their new foe with. They might even say things like "even Trump wasn't as deranged as this guy."
That said, I feel that Trump is the last stopgap before the real tyrant appears. There's always a guy who comes in before the real cataclysmic force appears. He operates within the laws, but is generally berated and stalled by the existing power structure, and ultimately fails. The established ruling class thinks they've solidified their grasp on the overall power structure, but, in reality, they've sent a message to the populace that mending the issues is impossible without violence. Then all it takes is a motivated member of the ruling class (either because they're afraid the existing structure will collapse, they're ambitious, or they have a shred of empathy for the rest of the populace), and they decide to ignite a rebellion.
If Trump fails by the end of his term, it's highly likely we'll see shit hit the fan in the following decade. The populace is too angry and the upper echelon is too isolated and out-of-touch that it's all but assured shit's going to hit the fan. It might not be instantly, but it's going to happen. Trump, ironically, most likely postponed it, but might have also redirected it in a way that will be beneficial once we get through the hard times.