This seems to be an over-narrow view. The GOP establishment lost the chance to put one of their own into high office. I'm sure this pissed them off. On the other hand, not having an establishment Democrat in that office is still a partial win. I think the smart play is to take the partial win and run with it, rather than fight it. But some prominent Republicans have chosen to fight it anyway. It's clear that not all of the GOP feels like they're winning, with a Trump presidency.
As soon as Trump looked like he might win the candidacy, the GOP establishment went all in on him. Whether or not he was one of their own before July 19, 2016, Trump is their guy now. Yes, a couple of Congresscritters have defied Trump in one or 2 votes, but that's not exactly unusual, and certainly not a sign that the establishment is angry with the guy.
Also, I think you're conflating the GOP leadership - the establishment - with Republican voters. I'm pretty sure people who voted for Trump kinda feel like they're winning. I'm not at all sure that GOP leadership and establishment politicians feel like President Trump represents a big win for their interests.
I agree that some (maybe even the majority) of the people who voted for Trump feel like they are winning. But 16.5, logger, elfgrinder3000, and other trolls all felt like they were winning as they trolled this forum, right up until they got booted (or quit before they could get booted).
As for the GOP leadership, publicly they are happy with the man and have his back at every opportunity. Given the crimes documented in the Mueller report they could get rid of Trump easily at any time, so the fact that they not only don't but actually cover for him is pretty strong evidence against your claim. A Trump impeachment would give them Pence, most definitely not a Democrat, after all.
I think the emergence of the Tea Party, the spoilering effect of the Bernie campaign in 2016, and the election of Donald Trump all stem from the same root cause: An electorate that feels like no matter who gets elected, we all lose. These are anti-establishment gestures. I suppose the establishment politicians could be happy with these outcomes, but it doesn't seem very plausible to me. YMMV.
I think the election of Trump stems from the emergence of the Tea Party; they are not 2 seperate things. Also, I question how many of those voting for Trump did so because of the anti-establishment street cred he got, and how many voted for him because they will always and only vote for anyone with an R next to their name? Strictly party voters may be anti-establishment, somehow, but you're going to have to come up with some plausible way of connecting anti-establishment and reflexive support of that establishment.
Without some citations, I don't think we can take this claim seriously.
What exactly do you need a citation for? That people voted for Trump as a way to troll the "libs"? Or that people voted for Trump who aren't bright enough to notice that his policies and actions have hurt our country?
Anyway, I'm not sure I understand how this addresses my concern about you turning the discussion into a win-lose game. It kind of seems like you're doing it in order to win some larger rhetorical battle in American politics, that you believe is being fought partly here in this thread. It also seems like you believe that victory in this particular engagement means victory over me and my opinions personally. I'm not sure this is actually the case, though. Could you clarify?
Sure, I'll clarify for you: your arguments are not the same thing as you. Me showing the flaws in your arguments is not a personal attack. You hiding behind claims of being personally attacked rather than supporting your claims does not either win you points nor advance the discussion.
Did that help?