He isn't going to be able to get much done, both republicans and democrats are against him. If Obama could not do a lot because he had the republicans against him, just imagine how difficult it will be for Trump who has the democrats and a lot of republicans against him. I am almost sure that he will not keep 50% of his promises. However, Trump’s election should be seen as an indicator to the internal issues in the USA, just like the Brexit did/is doing when it comes to the European Union.
Ps I am not a Trump nor an Hilary supporter. I just think that it is too early to do prognoses.