If Trump were to move over to a new platform, Twitter would go to hell.
If President Trump went to Gab, Twitter would crumble overnight. The media would have to follow him to whatever platform he went to.
Of course the media would howl that the President was using a “WASIS” Platform if he went to Gab.
If there was a new platform that might be true, but there isn't a new platform and not a chance in he77 there will be one before the election.
The big three thwart all attempts to compete with them. Sarah Palin first chastised the GOP for not recognizing the power in dominating Social Media and like most other advice she tried to give it was ignored.