Strange that you think the Jewish demographic won't support Trump after all the pro-Israel policies he's implemented, like moving the embassy to Jerusalem. I guess the Israel stance isn't so important to Jews living in the US?
I think blacks and hispanics will have more Republican voters over the next few years, but still overall vote Democrat. What do you mean by Republican policies being "bad" for them? Do you mean that by Republicans are anti-welfare and government handouts?
Hard to say long term. A lot will be determined by how well Trump enacts his agenda over the next 2 years.
Republican presidents have kowtowed to Israel for a long time, American Jews continue being one of the most liberal voting groups.