Vernacular and 'localized' dialects can be useful, fun and important in establishing an identity and emphasizing one's heritage. The difficulty arises when having only that form interferes with one's ability to communicate outside a narrow area, look for a job, or do modern things like establishing a web site.

Unfortunately, there are way too many folks who cannot switch into the 'standard' form of a language in order to compete when necessary.

"The boy turn around and say to his mother" is fine at home, but is not how to compose a paper in a college English course. (This is an exact quote from the paper of a star football player when I was in college).

I am not sure how to approach this problem, as there is, in many ethnic groups, a strong aversion to even be heard "talking like the man".

   When demographic isolation implicitly led to regional & ethnic language diversity, it all made sense....but the with modern travel and internet situation, I'd love to see people retain their ethnic 'identity' while still being able to converse in what the Germans call "Die Umgangsprache", or the basic form of the language you'd hear on the evening TV news.