I'm not altogether sure that Trump's base is all that cohesive anymore. The ones that would take to the streets, primarily the hyper-nationalists, talk a big game and like to troll on the Internet when they can make themselves seem more threatening than they are, but their numbers are considerably smaller than most people realize.
The bigger question to me is whether they will go to the polls in November. I don't think they will. For the average person, the tax "payoff" was not very big, and there are quite a few Republican voters who are more concerned about the damage to the national deficit and the lack of anything in the way of meaningful shovel ready jobs after the GOP has controlled Congress and the White House for two years. They are worried about their Medicaid payments and their Disability checks, and they are worried about the tariffs. There's also a general phenomenon that mid-term elections after a change in party almost always put the opposition party back in power in Congress. Ryan has not delivered to the rank and file Republicans. This means that the Trump "faithful" is about 20% of the voting electorate (or maybe about 12% of the total voting age population.
I've been under the impression that Trump believes that he commands about 45% of the country. When he was first elected, he may have had enough clout to do something both audacious and fundamentally disruptive. What's more, he's notdelivered to politicians, and if anything his involvement in a political campaign is seen as a liability. The only ones that are still Trump loyalists are those politicians in deep red districts. Trump has lost the military, if he ever had them.
For all that people fear Pence becoming president (which was obviously another piece of insurance), I think that the FBI, CIA et al, are more likely to work with him than they are with Trump, especially if they are holding his leash (the threat of indictment in another sealed envelope). That weakens the threat of a constitutional crisis where the country ends up in the hands of the Speaker of the House because both president and vice president are in jail. It's one reason that I don't see Mueller necessarily pursuing charges against Pence - not because he's not guilty as hell, but because he represents an island of comparative stability in an otherwise chaotic landscape.
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