We should probably distinguish between talk of "scrapping" that Pres. Trump, in his characteristic bombastic fashion, uses for rhetorical purposes, and what we end up with.  It may well be that upon re-examination, a significant portion of what was originally in it is reinstated, because it works acceptably to all parties.  In a sense, it's like the way we sometimes "fix" computers by turning them off completely (including power), waiting a bit, then turning them back on.