I'm not sure how they plan to offer 1Gbps to multiple premises when the fastest Internet connection speeds most Tier1 providers offer is an OC48 (2.5Gbps) or GigE. Recently 10GigE has become an option, but I don't know how widely deployed it is.
I also don't see why they'd have a problem pricing it, when they can simply look at their own costs for the upstream bandwidth and price accordingly. Admittedly, Tier1 bandwidth providers networks are often not oversubscribed. Residential ISP networks often reach 50:1 or worse over-subscription rates. You do have to pay a premium to get guaranteed bandwidth with an SLA.