I'll echo Seth Myers in saying that I've been wrong about him so many times that, if this trend continues, he'll be a great president.
People have been wrong about how voters react to him, not really wrong about the man himself.
As far as what he'll actually do in office, we still don't really know. It's like getting in line for a roller coaster covered up with sheets. We don't even know if it's fully constructed yet.
For example, he wants tax cuts, larger military, and infrastructure spending. Together these will likely exasperate the budget deficit. He hopes he can grow the economy enough to expand tax revenue to pay for it all, BUT if the optimistic plan fails, what will he give up to keep the budget in line, or will he just blow the budget, setting us up for a crash without enough in the tank for an emergency stimulus?
The real test of a leader is not when their plans go right, but how they adjust when they fail.
On trade, what if trade-wars start and it becomes clear after a while those wars are hurting our economy? Will he back down, and double down?
And what will he do if Russia invades more territory? If he keeps ignoring it, we may get Soviet Union 2.0. Those were scary days with too many close calls; we don't want them back.
Add to that his ability to agitate countries and ethnic groups.
Spock impression: "This is a fascinating experiment in leadership. I just hope we can watch it from a safe distance, Captain."