I think you've described an optimistic scenario for a Trump presidency, but there are also worst case scenarios. By far the biggest problem is that his persona

I think you've described an optimistic scenario for a Trump presidency, but there are also worst case scenarios. By far the biggest problem is that his personality cannot tolerate losing or insult. I don't think he would accept "losing" to ISIS and would possibly escalate things to obscene levels—he seems to be a big fan of nuclear weapons. Domestically, he is entirely intolerant of criticism. He's made it abundantly clear that he would like to make criticizing him illegal and openly encourages his supporters to beat up protestors. Keeping free speech alive will require a vigorous defense of separation of powers, and even then I'd be concerned about his supporters taking things into their own hands.