I live around the Twin Cities metro of Minnesota (two cities split by a river), which installed its first passenger light rail about 20 years ago. I recently moved from the north suburbs to the south side of town. I was very excited to be able to drive 10 minutes east on the freeway to my buddy’s house within walking distance of a station to take the 10 minute light rail ride downtown for a basketball game. Previously I would have driven 20-40 minutes (depending on traffic congestion) to pay $20 to use a parking ramp because the light rail doesn’t extend north.
Over the last 20 years they have extended the rail between the airport/Mall of America on the south side to the downtown of one city, and connected that downtown to the downtown of the other city across the river. If you live anywhere north of the city proper, or more than a few miles away from the one line running south, there is little reason to use the rail system over driving the whole way. If you do though, it’s pretty great.
That’s just been my experience, my understanding is some larger cities (Chicago and NYC are what come to mind) have more robust rail systems, but many cities (mine at least) have limited access for most people living in them.
When I consider changes to language, I try to start from a prescriptivist position rather than a descriptivist, which to me means assuming language should stay static to ensure a common understanding rather than fragmented meanings that lead to misunderstandings. If there is a change in language, it should justify itself through simplifying terms or adding a new meaning that other words lack, while avoiding harming the meanings of pre-existing words.
I use they/them pronouns for non-binary people as an example of this mindset in action because I think the benefits far outweigh any cons. With a greater understanding that non-binary people new language was needed, and they/them seems to me a very natural fit as I would already think to use it when asking about a stranger even before I knew of non-binary as a concept (“oh your friend is coming? What’s their name, are they a boy or a girl?). In my experience having a very close non-binary friend I have found that context tells whether I’m using they as a singular/plural pronoun ~90% of the time, and when it fails it adds maybe 20 seconds of clarification to explain I was referring to person’s name.
I think what you’re saying should be taken as inspiration for further evolving how we use those terms to better separate between singular and plural use rather than try backtracking on how it has already evolved in common use, and I think the answer (for me at least) lies in your very comment. Much like “you” vs “you all”, going forward I’ll put a little effort into using they/them in a singular context and use “them all” or “they all” as a plural. Maybe it will catch on and 30 years from now we’ll be saying “theyal” and “theyal’ll” as shorthand for “they all” and “they all will.”