I've wondered many times what people need this kind of speed for?! I struggle to even see what people need more than 3G (HSPDA+ that is) speed for..., I get 42mb download speed on my VDSL connection at home and that is more than enough (enough to grab a TV episode in 1-2mins), rather than speed, latency is of more interest.
Even if someone says tethering you still don't need that sort of bandwidth, besides (not that it affects me in the UK) can you imagine how quickly the American Telcos would throttle you with that much bandwidth available to you, if they're struggling with their current subscriber base on 3G/4G...