Imagine having a giant mob willing to march and take the fucking capitol, doing it while the police supported you and the army looked to their bellies, and not even getting concesions out of it. WORSE: your movement and party is shitting itself after it.
I really believe they could have pulled something IF Trump wasn't Trump.
To be fair, Trump and Cruz had zero institutional support for a run and they were the only candidates to get any meaningful voter support in the 2016 primary. Their base has only moved farther right since. Unlike the Dems, the old guard GOP has long since lost control of their primary voters.