He has only run his businesses in dictatorial, vengeful manner.
That is not going to play well, even with the Republicans in Congress. Remember, most of them despise him. They will get alone as long as he does what they want, which won't be for long if ever.
The only way Trump could be a good president is if right after taking the oath he has a massive coronary and falls on Mike Pence snapping Pence's neck on the way down. I'll take Paul Ryan over those two.