IPv6 exists extensively outside of the mobile carrier space and has for quite some time. Major backbones all over the world have been utilizing it for years and years. Service provider cores use it, the government has mandated it for .gov locations (although too relaxed, as we agreed upon earlier). Cloud providers use it. Want to outsource all of your stuff to the cloud? If the marketing hype has it's way everything will be in the cloud, I'll bet those cloud providers are at least using v6 to communicate internally. Are your sites in a CGN like Akamai? They do IPv6. Want to host your stuff in Amazon cloud? Also doing IPv6. Google Apps? IPv6 aware.
Your machines use it on their local segments for a huge amount of services unless you disable it. Desktops are tunneling it by default unless manually disabled. Any modern operating system will prefer it, tunneled or natively.
Enterprise stuff is the easy part, enterprise is generally conservative and slow to change, and that's fine.. It's all the other pieces that will force it.
We need to take it into account, for QoS, if used, and for everything else.
