There are some things that Trump can change and some things even he wont be able to change.
First of all he needs to pick his battles and decide what he really wants to change and what he said he would change just to get elected or because it was the opposite of what the opposition was saying.
I doubt he will be great but the fact that he pisses off the opposition so much is very entertaining.
At the end of the day the US and most western countries for that matter have pretty much a two party system where one gets in and does their thing or the other gets in either because they win the vote or because they get enough protest votes (ie not voted in... the other party is voted out).
Most parties are middle of the road these days and not really that much different except in a few key areas. ie more of the same... it has a different label so you can pretend you are trying a different brand but the crap is all made in the same factory from the same shit.
Anything that might be very different like Sanders or the two candidates that also ran for president never make it to your local store...
Welcome to democracy... makes 1984 look like a bright vision of the future really.