If you wrote up a list of the top 500 Republicans (governors, Representatives, Senators, AG's, etc), you'd find that around twenty-percent of them have angled toward anti-Trump theme over the past six months. In their mind, the public needs to move on and not be some concentrated on Trump.
I've spent a fair amount of time thinking over this problem (at least with this twenty-percent group), and come to five central observations:
1. The pro-Trump voters want someone who obviously knows business, commerce, taxes, and trade. To be kinda honest, the party has never had anyone who'd fit into this side of life....they produced a bunch of lawyers who weren't that gifted into the knowledge that Trump had.
You can pull out the front-page of the Wall Street Journal and circle the top ten stories of the day. Trump could be brought into a room, and asked on the ten stories, and have a general fundamental view of the story and give you an idea of what's going on. Bill Clinton, George Bush, or Barak Obama? Nothing.
So there's this disconnect from the professional lawyer-politicians, and the general Republican voting group. The enthusiasm is never going to return.
2. Trump could see some criticism leveled at him by any number of Democrats, and within ten minutes....form his own counter-criticism back. From the current group of Republican-wannabes-for-President? Not a single one is capable of performing that action.
3. Pick up the top fifteen platforms that Trump had in 2016 and 2020....then ask these 500 Republicans at the top.....can you match the same platforms? There will be an awful lot of silence, and some will admit....well, yeah....they could support ten of these. The wall business....the tough stand on China trade? No....none of them will go to that extent.
By limiting their positions....they just aren't capable of getting public support.
4. Cornering the news media? Over the past twenty years....the news media attached itself to a biased position or signed onto fake news. Ask yourself....who from the 500-odd Republicans can stand against this type of 'mess'.
5. The emergence of frustrated voters....who just want to start firing people within the government? This is part of the whole story as well, and if you lined up the 500-odd Republicans coming after Trump? Well....you just won't find anyone who seems capable or desiring of firing folks.
So as much as new brand 'dump-Trump' seems to be uttered by various Republican 'fakes'....they have mostly identified themselves as the ones who probably need to be dumped or fired.
The emergence of non-lawyers in the future for Republican candidates? I suspect this trend will continue.