No doubt 1Gbps is desirable and will be needed eventually. So it is good when the ISPs prepare for it and start making it available. Just like 100Mbps would have been considered overkill say 5 years ago but is common now, similarly 1Gbps might become common in another 5 years time.Some good usage of 1 gbps examples... downloading game contents (50 GB, 100 GB etc) in minutes instead of hours.
For someone like me, downloading software (linux ISOs) which are around 2 GB will take seconds instead of minutes.
Basically, there was a huge leap for me going from 4-8 mbps ADSL to 100 mbps FTTH now similar another huge leap if I get 1 gbps speed.
Having said that, currently there is no real case use scenario for a home user needing a 1Gbps connection. The leap from 100Mbps to 1Gbps is not that big. Most servers don't provide anywhere near that sort of download speed. WiFi doesn't easily allow you to download anywhere near that speed. The difference in a download completed in 20 seconds vs. 5 is insignificant. Unless you are running a buisness where you need to download and upload very large files frequently or have a large bunch of teenagers streaming 4k and downloading at the same time, you would not see much benefit from such speeds over 100Mbps. Still, early adopters lead to technology improvement.