It means the Republicans will be winning in 2020 by a landslide because the public will see it as HRC stealing the election. Or Trump could form a new political party and pull a Ross Perot like move and form something that is like the Reform Party.
Just as it did for Bush 'stealing' the election?
I'd expect the midterms to be a Democrat's bloodbath. That would probably look something like this (give or take Minnesota).
This would be a GOP +14.
Then, twelve years is quite some time for a single party to control the white house. Unless, the Republicans barf out an even worse candidate that Trump, it would be an easy victory.
That's not what happened in 2002. You also need to keep in mind there's an ideological struggle, and the 'nevertrumpers' would be blamed in such a situation, that doesn't mean all those nationalist trump voters would back a 'globalist GOPe candidate', when 'the globalist GOPe refused to back them'.