While many say that they don't do things that would require Gigabit, would they find a use for things they currently CAN'T do with a limited connection?
Consider: With Gigabit available (like Google Fiber here in Kansas City), your connection to the Internet is the same speed as your LAN connection. If my best friend has Gigabit as well, then we are able to send and receive to each other at a Gigabit (confirmed by friends with Google Fiber and by Google themselves at an event I attended).
When you take the concept of a LAN, and extend it out to the Internet, you need to challenge your paradigm of "Internet". Cloud storage is then the same performance as NAS. Your buddy, via a private VPN, is on the same network as you despite being miles apart (handy for LAN gaming!) Private FTP servers will be a viable option for moving files around.
Then take the concepts that businesses use LANs for, and you will see new applications available for home users. Collaboration tools become effective over the Internet. Face to face meetings with full video are ready to rock (Think a computer with multiple monitors doing a virtual family reunion with a monitor (or Window) dedicated to each person.
Finally, what does a high bandwidth, low latency connection allow? Perhaps we could finally get our robo-presence devices going (think the Episode of the Big Bang Theory where Sheldon went to work virtually via a robot with a monitor for a face at the office.)
My point is that the things people think they use the Internet for are limited by the tools and such developed in the last 15 years since the broadband introduction. But how many people would say they needed that speed when they were on modems saying "All I do is log into AOL to check my email and sometimes go to a chatroom to talk about cats? What would I need to do that faster?" Oh, that's right... until the speed was available widely, the applications weren't available to do other things. This isn't something that can be easily judged by the "Gigabit Have-Nots", because they do not yet comprehend the possibilities. The times are changing, and the demand will increase as developers find the market opened up for its use.