Currently have 1.5 gbps up and down. For $10 more a month I can get 3 gbps. Some areas around me are getting upgraded to 5 gbps and 8 gbps. FTTH was installed in my area a year and a half ago.
My network has 1 gbps switches and no device can handle more than that. So no real need for me to go for anything faster. Getting a couple of 10g switches with poe costs a lot for something I probably wouldn't notice right now. Downloading from steam is already at it's limit due to CPU bottlenecking.
You could make the argument that multiple devices could use the speed simultaneously. But in my case, I am the only one using the wired connection. The rest are using WiFi, so the extra 500 mbps may not be used by my computer but could be used by WiFi devices at the same time as they each use a different port on ISP router.
I have. Ever download steam games on multiple computers at the same time. 1 can almost saturate it for me, but is CPU bottlenecked. Finally getting over 50mbps upload is also really nice, coming from cable to FTTH.
Really depends on how many people live in 1 household and what they are doing.