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My take is - Trump is able to attract sizable number of votes (and at the same time lose almost an equal number of votes), but in the long term he is detrimental to the long term prospects of the Republican Party. He only cares about himself and will go against the party if he doesn't get what he need. This guy has transformed the GOP from a center-right political party to one at the fringe of the political spectrum.
Trump's base does not care about the future of the Republican party, as far as they are concerned, it is a battle between them and the hidden forces who want Trump out the game, and there are actually people within the GOP who are very unpopular among the average Republican voter, aka Mike Pence.
in spite of Trump being what he is, there is still a chance he becomes president again if not indicted this year, that means there will be much people who may bet on his victory if his Democrat rival proves themselves to be "weak" against him.
That is going to help Democrat party seal the future for them as well. We are going to see the whole nation who are against this new Republican party at the Democrat party, not like they were so awesome before, but right now the in fighting of that party made it even worse.
That will cause a lot of rumpus with the voters, there will be republicans fighting republicans which will only help Democrats. Fine by me actually, rather see DP there instead of RP but at the end of the day this will only cause even more trouble in the future for the whole nation, it is not going to go away anytime soon, it is going to be an issue everyone in the whole nation will have to fix, even if not today, eventually one day.