All that was accomplished in the three years that this rhetoric has gone mainstream - and not at 'great expense of public opinion'. I don't think a single American has had their mind changed on this subject, since the last election.
What do you expect 2020 will bring, in the event of another Trump victory?
There's a very clear message to immigrants, here. A lot of people think they are the cause of the country's ills, that they want them gone, and they have just gotten started on this project.
So to answer your question, in the event of another Trump victory, I expect immigration to the US to continue at near-record rates, while they continue to be called xenophobic.
[1] https://www.dhs.gov/immigration-statistics/yearbook/2017/tab...
[2] https://www.washingtonpost.com/immigration/number-of-people-...
[3] https://www.pewresearch.org/fact-tank/2019/06/17/key-finding...
There may be a lot of xenophobic rhetoric, but actions speak louder than words, and what precious little action there was (bans for Muslim countries that account for a negligible number of immigrants, and detention of children at the border) was both very ineffective and very politically damaging - the exact opposite of what one would do if one wanted to limit immigration.