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Trump currently (July 9-15) has an overall approval rating of 43 percent and 90 percent amongst Republicans.
Gallup: Presidential Approval Ratings -- Donald Trump
Maybe it will go down slightly in the next poll, but not by much.
Hypothetically, it is safe bet that if Trump were to leave the Republican party to form something like "The Trumpublican party", only his core base would follow; about 25%-%30 of the republican party. The remaining 70%-75% would turn their back on him and be demanding he be impeached along with 98% of all democrates.
Long term perspective is that he is destroying the republican party, and unforuntionly short term he is causing damage to the US. It is in his DNA to destroy things, to great division, to break laws, to be unethical, to use people, and have self-awareness on par with 3-4yr old. Bottomline, he is cancer. Everybody that associate with him ends up regretting it. And in the end, so will Putin.
If DT were to suddenly die of a heart attack tomorrow, he'd be leaving republicans with one fucking pile of shit to clean up, and no one to turn too for help. But secretly\privately they would be glad the mother-fucker is gone.