Don’t you all think that Birmingham is simply a living example of how place names change over the years/decennia/centuries/millennia…
If we go up a step in place naming to urban level, I am sure there have been many English-language names which have lost an ‘s possessive ending… just from a quick UK google: Brownsburn, St Johns-in-the-vale, Douglas Water, etc.
Point I’m trying to make is that apostrophes are not really a feature of place names in general. It may be logical to take that down to street level as well, certainly wouldn’t bother me much. It’s not like the semantics are really gonna suffer?
After a few hundred years, there are relatively few English place names which retain any original apostrophe. I would say the same effect would apply to street names after a long enough period.