The way the system in America works it will be hard for President Trump to get some of his more extreme policies enacted. The President does not have unlimited power. In the same way that Brexit is getting hooked up in legal battles, so will banning muslims and building the Mexican wall. And American courts ARE political - unashamedly so.
His success does carry another of the same problems as Brexit - it is certainly not true that half the population of America are racist (or 52% of the UK) but the racists now think that half the population agree with them. I think life will be very hard for anyone who looks or sounds foreign in the US for a while, just as has happened here
We have to hope that he is more pragmatic than his sound bites suggest and that he will now tone down the lunacy.
I suspect this is not the last political upset the West is going to see in this decade. Brexit is beginning to look like the head of the curve unless the political elites can come up with a more convincing response to the outsiders.