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The wall will have to be built at some point, there is no doubt about it. Who knows, even Biden may have to be the one to do it.
Immigrants all around the world realized that governments today are very scared of taking any measure against illegal immigrants, especially if the government in power is right wing. So if you have the money to try to cross the border you will just do it. The same happens in Europe with people arriving in boats with the help of ONG's. They are not refugees, most of them are just people wanting to move for a better country.
You either ignore the problem and let everyone in, or build a wall, or change the laws. Of course, this do not cover all people arriving as tourists that never come back.
My take is that governments will just ignore the problem.