I think that what you'll end up getting, is legal immigrants from largely not-third-world-shitholes to self deport back to i.e. Europe, Japan, China or even Mexico, whereas people from actual third world shitholes with nothing to lose will just roll the dice and attempt to stay. Not to mention that I find it unlikely that illegal immigrants care about that.
On the flip-side, the performative side of things created probably the largest pro-immigration sentiment in the US in recent history:
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So yeah, I think that once the republicans lose the white house, you're getting immigration on steroids. Sure as hell worked out great.