Not being argumentative but what does bandwidth and/or speed have to do with the neutrality rules?
The neutrality rules say that the provider cannot limit the bandwidth to any user, even via a tiered pay for bandwidth scheme. So, a few hogs--downloaders, spammers, get a lot more service than most, which in turn requires more overall capacity on the part of the provider. He can only provide that by charging everyone more, or by not improving the bandwidth available at the curb.
For example... Verizon now gives something like 15 MBPS service at the curb, but theoretically, their fiber can handle much, much greater bandwidth. But, if they improve the curb level technology, then they will have to make dramatic improvements in their overall backbone capacity. I contend that net neutrality will disincentivize them.