Good news indeed. Even if everyone isn’t primaried, it should at least mute their public criticisms of Trump and stop their ankle-biting ...
That's pretty much how it goes.
The verb decimate originally alluded to the Roman punishment of executing one man in ten of a mutinous legion. You (by voting out) decimate one-tenth of the anti-Trump RINOs and it serves to tighten the sphincters of the remnant.
Lather, rinse, repeat the next primary cycle for those who didn't learn the lesson. MAGA in Congress ain't gonna happen overnight.