Meh. The Republican base takes "voting against your own self-interest" as a core value. All it needs is some nice gentlemen on the radio screaming about how they have less money now because something something gay Mexican welfare moms, and they'll keep steadfastly voting R.
I honestly don't expect this to swing that many votes that weren't already swung. I think popular attitudes towards Trump are going to be the bigger factor in any electoral swing.
See, this kind of thing is what we were talking about earlier and what makes you totally non-credible. I live amongst the "Republican base" you're describing and I can categorically state that this is not true. Nobody's going to flip Dem, because Democrats ratcheting up your taxes openly isn't better than Republicans raising taxes after pretending they won't, but primary challenges are looking distinctly likely.
Dems will tax you and use that money to pave your roads, build a park, fund your schools.
Republicans will claim they're giving you a tax break, really won't, and then use that money to offset a 15% corporate tax break.
You tell me which one is in the self-interest of the average person, be they Republican or Democrat?
And sure, Republicans will claim that the corporate tax break is even BETTER than services, because corporations will automagically use all that newfound wealth to create jobs, raise wages, etc. (and then people can afford to pave their own roads, I guess?) Except that anybody who's been alive more than 10 years knows that this is not what will happen. CEOs have flatly stated that's not what they're going to do with the money. That money gets transferred to shareholders, either in the form of dividends or as higher stock prices created by stock buybacks.
It's the same goddamn trickle-down bullshit that has NEVER worked. It didn't work for Reagan, it didn't work for Bush, it's not going to work for Trump. But it doesn't matter, because as you yourself point out, the Republican base isn't going to start voting for Democrats, because
they're Democrats.