I agree with most of this, but there are two major factors that are going to shape the scope, tone, and efficacy of his administration.
One is what that administration is actually going to look like, from the front-page cabinet appointments to the political appointments in the executive agencies. I'm inclined to think that these are going to be standard-issue Republican fare, particularly the latter. Industry lobbyists and corporate folks running the regulatory agencies, etc, very much like the GW Bush administration. That won't be a coincidence, since it's Bush vets who are going to make up the pool of experienced candidates, in the same way that Clinton retreads populated the Obama Administration, particularly early on.
The second thing is the extent to which the Congress, on both sides of the aisle, is willing to adopt his agenda, potentially to the detriment of their own. He's not really starting with a strong hand here, as a polarizing figure who lost the popular vote.