You realize that, on some level, Ted Cruz
is next in line once Trump loses, right?
Anyway, you've presented a coherent image of what Trumpism is in this thread, which is not entirely original to you but is more fleshed-out than most previous explanations I've heard from actual Trump supporters, so I commend you for that. The problem with the ideology you've presented is (and, to some extent this is a problem with the personality of Trump and the way he has run his campaign) that it is, at least for the moment, most decidedly
not spreading to the congressional GOP; and it is one that cannot hope to triumph in a presidential contest.
If the ideology you describe has a future in American politics (especially, but not solely, because of the generational problems that what you describe encounters), then it's a future as one element within a congressional coalition. There are parts of the country where what you describe could (or does) command a decisive majority, but ultimately it is only barely capable of grasping a presidential nomination even when it is fully united and its opponents are hopelessly divided (and, even then, how much of that is ascribable to the worldview and how much to the personality of Donald Trump -- which has no future beyond the man himself -- is a difficult question to answer; certainly logic dictates that what you describe
should have been stronger in 2008 and 2012, when the economy was worse and Millennials were a smaller proportion of the electorate, than now; yet before the personality of Trump it utterly failed to present itself), and there are too many within the right-wing coalition who would actively prefer a Democratic administration to "Trumpism" for it to ever triumph in a presidential general election (and considering demographic trends this should worsen with time).
tl;dr What you describe is an actual phenomenon, but it needs congressional adherents before it can really exert a force on US politics and focusing on presidential politics is likely to be a counterproductive effort.
