There's really no mystery to this: Verizon is sticking to that unconvincing party line, because they're between the proverbial rock and a hard place. The restrictions they agreed to when they purchased their Block C spectrum license state that they're not permitted to restrict the ways in which you use your data connection on their wireless network; if you want to tether your BitTorrent PC to your Verizon Wireless cell phone and let it saturate that connection 24/7, they can't stop you -- they quite literally can't even slow you down. Thus, in order to make that kind of abuse of their network exorbitantly expensive, the only option that seems to be left to them is metering. We could probably argue ceaselessly about whether or not their current metered plans and overage fees are actually reasonable based on typical user activity -- but that's another discussion entirely. The point is, Verizon is never going to back down from those meters. Because they can't.
Mind you, I'm not making apologies for them... they made their bed, (by buying that spectrum in the first place) and now they have to sleep in it. But I don't have to sleep in it with them.