This is like the epitome of wishful thinking, bordering on delusion. Some of the more "traditional" conservatives who fell in line behind Trump despite not liking his demeanor are now moving over to a slightly more well-spoken (as high of a bar as that is) fascist in DeSantes. If you think for even a moment that Trump won't smear the absolute shit out of DeSantes when it comes time for the primaries, and if you think for a moment that Trump doesn't still have legions of followers who will take those smears and run all over town with them, then I really don't know what to tell you.
This split cannot possibly make the Republican party stronger. Their game plan was never to rely on electoralism; only liberals are that delusional. Their game plan was always to overthrow democracy through extra-electoral means. Ours shouldn't rely on electoralism either (this isn't to say that voting is bad or any of that shit, but we need to start forming working class solidarity via strengthening unions, and forming community aid groups, and we need to do it yesterday).