" Most everyone who immigrates to this country realizes that in order to benefit from living here, they need English, and most learn it surprisingly quickly. I think we should leave it like that. "

Precisely!!!   Water finds it's own level, attempts to divert it usually won't work.    I honestly believe that the issues that were brought up here might be happening more frequently then they were 10 or 20 years ago, but it is not a unique situation. It is unfair to categorize anyone who speaks a different language as "not wanting to learn" the language as generalizations are usually wrong too.