He supports this by using the anecdotes about how airlines don't serve peanuts and how he had a social encounter where only kosher food was served. And from these two incidents, he jumps to the claim that "Europe will eat halal."
Notice he doesn't make the claim that Europe will increasingly offer halal food as an option. That would be a plausible result of having more Muslims in Europe and would in fact be equivalent to the Indian scenario where people are given a choice of vegetarian as well as meat options. But he says Europe will eat halal! If that were true, we should've seen India eat only vegetarian food given we have way more vegetarians than Europe has Muslims and yet that has not happened. Is this because Indian vegetarians -- of which I am one -- are uniquely tolerant, or is it because he is absurdly overstating his case? I think it's the latter.
There's no such thing as kosher/halal pork, and no such thing as vegetarian-approved filet mignon steak. People who can will still eat their pork and beef, rather than succumbing to the no-pork, no-meat practices of the minorities.
I said in my response to abiro that "easily accommodated minority preferences are often accommodated". Which is obviously true.
But that is a very inane and obvious claim, and not at all what NNT is saying. He claims the minority will "win" and that is not a claim he's able to support in any meaningful way. Unless we're redefining the the word "win" to mean something totally new and different, I think he's overstating his case.
They can tell the difference between a veggie burger and meat burger.