That is not what happened in my district. We bounced some long time GOPe people out of delegate spots. But we organized in advance of the vote. We overwhelmed them.
We did a few things wrong but we are learning as we go. It is not a overnight thing like you imply. We are in for the long hall.
I certainly didn't intend to imply it's an overnight thing and as a matter of fact have said in comments here and elsewhere that overthrowing the power elite in the Party requires getting in the trenches with grenades and sharpened entrenching tools.
Hardly an overnight or easy process. Conventions, though, are an opportunity to use media bad publicity as artillery to break through the first line of trenches. People feel empowered when they see something happening on a national level and Conventions are the three ring circus where the outsiders can put on as good a show as the insiders can if they ban together in sufficient numbers.
Alas, everyone has better things to do than participate in a mass show of strength just for politics now that the Republicans control both Houses, and has had better things to do for the past eight years, so . . .