It's been about 20 or 30 years in the making. The question is, are we going to "multiculture" ourself to this point too?
We're screwed only if we start accepting Muslims at the same rate Europe has. Sadly enough, however, it's much easier for a Muslim to get into this country legally than for Mexicans to enter legally. Go and look at the website for the DHS (which now controls immigration) and you will see that Muslims or at any rate, people from the Middle East, can participate in the lottery with virtually no effort.
English-speaking Europeans are completely excluded (along, I believe, with Aussies). Our immigration system is seriously flawed, but not the way most anti-Hispanics on this site think it is. Prohibit Muslim immigration to the US. Give me Mexicans any day.