Perhaps the way to look at this was that "ok" came not from the events that created it, but from the niche it filled. There must have been a need for the term or it would not have thrived and spread.
English has all manner of ways around the fact that we abandoned plural "you" around 1600 or so. Y'all, yinz, you-all, you guys. I grew up in the South, so it's "y'all" for me, but there's nothing fundamentally wrong with "thou/thee" for singular and "you/ye" for plural second person. It just was victim to the euphemization treadmill until it fell out of common usage, so we had to reinvent it.
