What an odd post Brummie, even if done in jest. You do realize that during the Irish potato famine in the mid 1800s approximately 1 million immigrants from Ireland landed in this country. And did you also know that ~70% of those people went to New York City. It takes no stretch of the imagination that there truly are millions of people in this country that can claim Irish heritage. And it's perfectly fitting that there would be an "Irish pub" in New York City.
From the Irish Diaspora entry at Wikipedia: "Irish Americans number over 44 million, making them the second largest ethnic group in the country, after German Americans." So you might be right, if Irish descendants the world over moved to Ireland it just might sink.