Related to this idea, I thought that at least some non-human races (especially goblins) might also see a similar evolution, especially given their shorter lifespans. At the very least, I think we've seen at least a nod towards two distinct goblinoid cultures at different times - Skelk-like warrior goblins and the more cultured Rhyelian goblins. Perhaps some goblin communities could be evolving towards being hobgoblins or something like that?
Finally, when talking about ancient languages, we tend to focus on human languages. However, I think it would make sense to have at least a few non-human ancient languages. Draconic could possibly be seen as an ancient language by this time. But, I think some PC races could also have ancient languages, like goblin for sure and maybe gnollish if it has a written component. Elves might even have ancient languages by this time, like Seelie and Unseelie, and halflings could have Cellwair as an ancient language if it's not something widely spoken by halflings today.
Just tossing out a few ideas that came to me before I forget them.
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