Earlier quoted context omitted.
I said that it would reduce demand, not that it would eliminate it.
Has it reduced demand in Europe? In general. Americans regularly have deep-rooted fears about giving fellow humans a chance at a decent life. Are any of those fears substantiated?
I doubt anyone has studied that rather specific question empirically, though, and even if they had it's not an easy question to study. So theory and common sense is our best bet when it comes to forming expectations here.
I'm sure there are empirical studies about how demand shifts from A to B for other examples of substitute goods, though. Maybe start there?