Linguists studying the Southern American Dialect reckon that it ain't what it used to be, y'all. I do declayuh!
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I'm honestly really glad it seems to be a shared opinion that's changed over the years. About 10 years ago I got told it was unprofessional language in the workplace.
I've been using y'all in corporate America for about five years now and have yet had a manager condemn its use. It's widely accepted now and I've had coworkers mentioned it makes them fondly remember family from the south. It's just a good colloquial for referring to a group. Oddly enough "you guys" has slowly been entering my diction too due to working with more folks from the west and midwest.Midwest.
Ain't is one I still unconsciously avoid in professional settings though.
I think Black English has been a major contributor towards towards mainstreaming "y'all" outside of the South. The rise of black stories being told on television and through film, plus the rise of hip hop/rap as a mainstream genre of music, has helped normalize certain phrases that used to only be associated with either the South or with black vernacular.