I disagree. Even if Trump resigned or was impeached and removed, Pence would become the next President, followed by Paul Ryan and so on. Our system of government is well in tact.
I agree that there are people who want to see Trump impeached (for whatever idiotic reason) or severely damaged so as to lose in 2020, but I hardly think that's a coup.
I understand, and that is fine. I will agree that Coups are typically a violent, and forced takeover of power like what happened here in 1963, or what happens in third world countries all the time. However, if Trump is impeached without proper reason, I think that would be a coup, and I also think to keep an Administration reacting to a false narrative is dangerous, and "coup like".
Most conservatives, and libertarians despised Obama's policies, and divisive rhetoric. However, they never tried to de-legitimize him daily, in any meaningful way. The "birther" stuff went nowhere, and the media did not reinforce it like they are doing with all this Russia misinformation/disinformation campaign.