It's not really a big issue. Connecting the last meters of fiber is cheap, either done by default in new constructions, or on demand for older houses. ISP's hardware to run PON is cheap.
Once street level fiber deployment is done, whether market penetration follows or not isn't a huge deal.
Check the France map. This is cheap in densely populated areas, like cities. It isn't in mountainous areas with just small groups of houses like in the middle of the country.
Pretty irrelevant to the last meter, and most ISPs do it for free when you subscribe as they can re-use conduits and sheaths for the legacy copper line, otherwise it's typically a few hours of work.
I am clearly not talking about the last meter issue, I am talking about when the fiber is already in the home and sits unused. That seems like a pity (yes not a huge deal)
Once street level fiber deployment is done, whether market penetration follows or not isn't a huge deal.