It would seem to me that the Jews of South Africa, along with the rest of the Whites in South Africa, will soon be in immediate danger when the Black Marxists take over control of the government. I also agree with you that the Jews in Western Europe are in danger, due to the massive importation of Muslims and the politically correct attitude of the Western, European governments towards them.
In terms of the U.S, as I've said in other posts, I believe antisemitism and anti-zionism are worsening in the U.S. However, as I've said before, former Trump lawyer Michael Cohen, Rod Rosenstein and the Leftist, Jewish, Democratic politicians in Congress(House- Brad Sherman, Adam Schiff, Steve Cohen, Jerrold Nadler. Senate- Charles Schumer and Diane Feinstein) that are leading the Resistance movement against Trump, are growing and strengthening antisemitism on the Right, and among Trump supporters. This is due to the fact that Trump is seen by most Conservatives as extremely pro-Israel for moving the U.S embassy to Jerusalem, and not treating Israel like a pariah, as was done by Barack Hussein Obama. As a result, there is a great deal of resentment and anger towards these Leftist, Jewish politicians that are trying to impeach and remove Trump. I do agree with you that if Trump is impeached, there is a possibility that there will be a large increase in antisemitic violence. In a sense, your theory of massive Aliyah due to antisemitic violence, might not be that far off.