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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.