Higher bandwidths are good to have. They're great for rare, exceptional circumstances.
10G internet doesn't make your streaming better, but downloads the latest game much faster. It makes for much less painful transfer of a VM image from a remote datacenter to a local machine.
Which is good and bad. The good part is that it makes it easier for the ISPs to provide -- most people won't be filling that 10G pipe, so you can offer 10G without it raising bandwidth usage much at all. You're just making remote workers really happy when they have to download a terabyte of data on a single, very rare occasion instead of it taking all day.
The bad part is that this comfort is harder to justify. Providing 10G to make life more comfortable the 1% of the time it comes into play still costs money.