Doesn't this prove by example that there is no last mile scarcity on Verizon's wireless network?
Eh, yes and no. If Go90 can truly clog up Verizon's bandwidth, they'll be making so much money that network expansion costs are little to be concerned about.
The physical issues with congestion are real, and while Verizon can solve them, they want to be paid more (i.e. profit more) if they're going to have to spend more.