I got a feeling that any service not sitting behind a major CDN would struggle to feed more than handful of 25Gbit/s clients. That is maybe the biggest reason I feel >1Gbps for consumers at this point is kinda dubious prospect.
You can think of it differently - multiple people in your household can access different services or multiple 4K streams without interfering with each other.
As someone with symmetric 1Gb, it is really nice in that the effective distance from your house to anywhere and anywhere to your house becomes a lot smaller. With Gb+ backing it, cloud storage with a local cache becomes an attractive alternative to ever buying disks again.