Re: What are they going to do to solve the bandwidth issue?
It's possible that they are doing some >8 channel downstream bonding, but we don't notice it because there aren't any 16 channel modems available right now. If they intend on matching Verizon's 300/65, they're going to be nearly maxing out the "common" 8 down and 3 up configuration that a lot of people have. Something has to give if they're going to deploy that kind of speed on their existing system.
What also comes to mind is some unused channels that aren't being bonded too. My understanding of DOCSIS systems from the days of DOCSIS 1.0/1.1/2.0 is a cable company and have multiple downstream and upstream channels and they can be load balanced to prevent channel saturation. Perhaps that is what they're doing even if they aren't bonding more than 8 down, 3 up?