In switzerland, they started to deploy symetric "physical" 25Gb FTTH.
Namely, the limiting factor will become the actual backbone: non-domestic fiber "size" and carrier network routers (even those you have in local fiber network nodes).
Hopefully, the bandwidth will stay so overkill for the usage it will make low lantency QoS for very bandwidth limited traffic useless for a while (but better be ready because this is complicated and not only technically).