Trump will give a relatively restrained (for him) speech from a teleprompter at the convention. It will be uninspiring and completely devoid of any serious intellectual content, but it won’t be overtly racist or outrageous, and there will be no Trump Steaks as props. The GOP leadership, Fox News, and the WSJ will subsequently celebrate the belated arrival of the “New Trump.” Euphoria will reign in the GOP camp, unity will be the order of the day, and Trump will get a substantial bounce in the polls.
Until, of course, Trump gets bored with his buttoned-down persona and reverts back to Captain Outrageous. That should take about two weeks at the max.