The fact that you can get a 1 Gbps link to the internet is amazing. This is pretty much the fastest LAN connection you can get. The difference between LAN and WAN will be gone before too long (other than latency).
Not yet. But the cost of 10Gbe is dropping quite rapidly.
(They seem to cost in the $500 range these days. I'd pay $500 for a 10Gbps link to the Internet. What would I do? I have no idea.)