Regional accents are changing. Globalization is part of the shift, but so, perhaps, is voice recognition software like Siri.
It turns out that people have to talk differently to their phones from they do to their friends. An article in The Guardian says that some people in India and Australia report that their phones understand them only if they "fake an American accent."
In the U.S., writer Julia Reed complains that, "A smart person could make a lot of money by inventing a Siri for southerners."
So what do we do? Shall we produce enough versions of software for users' convenience to speak in their own accent, or shall we create an international common denominator for what we say and how we say?
A trend to watch.
Reference: "Cross-Cultural Communications" newsletter 2/12/2016