Totally unrelated but this Blaze Foley song talks specifically about getting back to a place "where the people say ya'll." It's beautiful:
P.S. Michael Cera does a nice cover of that song.
I grew up using guys just to refer to group of people
I love it. I blame France, specifically Remulac.
But this language has not been changing over time. This was a dictate from HR departments, made up from whole cloth. If anything has changed over time, it's that "gals" has been an anachronism for a long while, outside of a few isolated corners of the Southern and Western US where it can still manage to sound cute in some contexts. We don't really need a special diminutive for groups of women.
That being said, it's not formal language, it's chummy. If you're a 16 year old host at a restaurant speaking to a group of women older than you, you probably shouldn't be chummy.
"How are you guys doing today" spoken at a red lobster is absolutely fine, completely normal language, whether spoken by the president or by a child. It's the single most ubiquitous and wholly normal greeting that i know. Corporate really over does it sometimes
By one of the ladies, or by a manager who overheard you?
Well, I mooched it, and have seen it propagate here in the Northwest. Will not be long before it takes more general hold as we exchange people.
I seem to be bumping into it here (PDX) area more these days.
My favorite bit in all this is:
"All Y'all" which is simply plural for "Y'all", plus a subtle bit of familiarity state info.
If everyone is close, in agreement, likely to act as one, then "y'all" works for single as well as multiple people.
All y'all gets invoked when the group has differences. Maybe a few couples, or some people are new, or may be disagreeable in some way.
English is a lot of fun, because it allows for a very robust ad-hoc communication. Over time, the lexicon is never dull!