Two more things:
Very early in the presidential campaign, I wrote a FReeper editoral (here) listing the various kinds of people who could be cannabalized from the Republican and Democrat parties to form a Sensible Party that might be able to outvote the two remaining Silly Parties.
One problem that will show up again, with respect to some sort of "MAGA" brand, is that it will be usurped by all sorts of pretenders. E.g., the Tea Party movement in Colorado was pretty-much ruined by this. It became a regular pattern that the real Tea Party candidate was the opponent of whichever candidate the media proclaimed as the "Tea Party" candidate. Sometimes this was because media people (like a reporter at a local TV station whom I talked to about this) were simply ignorant of Republican Party internals and were easily fooled.
The Tea Party was not a party but a movement.