Excellent reasons. I’ll add a fourth: Trump has been a wrecking ball to the wall of silence that protects the other GOP candidates (sans Cruz) from debating issues they’d prefer to avoid.
I don’t want Trump for President but I want him to use his wrecking ball approach on the political establishment ..from top to bottom.
If he ends up President - it’s no different than Hillary or Jeb.
Maybe Cruz will end up being VP