He isn't presidential in any conventional sense. Will future candidates (particularly from the GOP) copy Trump's style? Or shy away from it?
Trump created a cult of personality around his persona, hate, and idiocy. Who else could the Republicans use to re-create these sort of dynamics? They don't have any career politicians to fit the bill, they'd have to find somebody from a reality TV show again or something. But the rub is that this person would already need to have a sizeable following, like Trump did when he became president.. This person would need to be able to lead the idiots the same way Trump did, and how many current reality TV show stars could do this? I don't watch any of that junk, but I doubt there's anyone like that out there really that would appeal to right-wing voters to nearly the same extent as Trump ever did.
The only sort of person I can think of who could work here is a WWE wrestler. That's the only way we'd get another 4 years of circus-like idiocy in the white house.
Trump is already taking his crazy followers and leading them to a cliff to jump off and abandon the Fox News and in the end probably the Republican party as well. Is this what the Republicans want happening every 4 years? I doubt it. They simply found themselves in a position they can't figure out a way out of. For now they have to support the idiot in charge because he has them by the balls. i.e. he controls a decent chunk of their voters.
Will the Republicans realize that this sort of cult of personality will just never really work out for them, unless they manage to flip the country and turn it into a dictatorship? I doubt it, they have a 4 year long attention span and get distracted by shiny objects that can easily sway their opinions. As more of the country becomes progressive over time they will turn to more and more sinister schemes to attempt to end up in a situation where the are able to win elections. Look at all the voter disenfranchisement they are responsible for these days. What else can they do? They don't have solutions to offer to Americans, they can only say: "Vote for us, we are not liberals, and we hate them like you"
It will probably be more clear what happens to the Republican party and what sort of future they might have after the moron is chased out of the white house in January. Trump will take his followers and lead them to wherever, and that will probably impact a lot.