I don't think we were ever "fine" with 56k, but I think we reached a good speed with 1Gb/s. It will be more than enough for most households until everything we do will scale up in resolution.
Well, 1gig is still somewhat rare here in Germany. Unless you live in a large city or you are fine with 5G as your line, its basically a far-away dream
- cloud storage, sharing and backup - at 40Mbit a remote site feels like a slow thumb drive where copying a 1GB folder of an image or video project to the cloud takes 5 minutes, at 1Gbit it feels like a modern hard drive where that folder takes 10 seconds and doesn't interrupt your workflow
- high res video streaming (3-4 people in your household streaming at 4K will overload your downlink at 100Mbit)
- high res video conferencing (3-4 people in your household being in zoom calls at the same time will likely overload your uplink at 40Mbit)