resolution criteria probably needs a bit of concretization, but as a lifelong "y'all" user, I'd say it has a lot of potential, monosyllabic, inclusive, quaint, and already in wide usage in AAVE and Southern American English.

by many metrics, I'd guess it already resolves this question YES, but I'd imagine you wouldn't concretize it in that manner.

@brubsby Another (more-or-less) lifelong y'all user here: I agree. I'd consider it mainstream-ish within my (disproportionately young and queer) social circles.

@brubsby I don't see a good way to parametrize it, but what I'm looking for is roughly >1/3 users using separate pronouns most of the time. Currently I haven't seen many people using y'all consistently, rather than as-needed.

@evergreenemily my southern upbringing combo'd into left twitter adjacency has essentially permanently entrenched y'all into my lexicon, so I'm a bit biased, but I essentially think of it as connotatively neutral and use it in all social contexts (even business communication). but then again, I am a lexicographical maximalist and will adopt most morphematically efficient lexemes into my vernacular :^) (like habitual "be" etc.)

@brubsby Oh, I use "y'all" all the time (especially when I'm speaking, rather than typing - at that point it's just reflexive.) I just notice it makes me stand out a bit in Less Online spaces since I live on the opposite side of the country now. Not in a bad way - it's just funny to see how it catches people, particularly older people, off guard sometimes.

@CodeandSolder yeah there's not really a good way to differentiate uses of second person plural "you" from second person singular "you" with google ngrams or anything. you'd have to do some pretty in-depth semantic corpus linguistics. (but there is probably a linguist somewhere that has done, or is doing this analysis now)

but I might suggest, for consideration if nothing else, "Resolves YES if a sufficiently large scale and representative semantic corpus analysis of English shows that second person plural "you" is used less than twice as often as other second person plurals combined"

and maybe decide if you want to count noun phrase pronouns "you all" "you guys" "youse guys" in the calculation (although choices of the linguist doing the semantic analysis might decide this for you)

@evergreenemily yeah lol. i moved out of the south and am slowly y'allifying all of my new older neighbors

@brubsby I moved out of the South more than 17 years ago, and for the most part my dialect isn't really Southern any more...except "y'all." "Y'all" has stayed the whole time because it's such a useful word.

@evergreenemily same, although i can still mirror a southern affect like nobody's business if i need to endear a southern grandma or what have you

“Yinz” in some areas is already in use. Not mainstream, though.

@JohnSmithb9be I thought that one was, like...basically just Pittsburgh?