Do you think bandwidth is a limiting factor here in practice? FiOS, for example, has plans ranging from 25 to 75 M bits/sec.
My impression is that having a sensing apparatus to sense and process would be more of a limiting factor. A skull sensor that detects, say 20K neurons, with 1 ms resolution would only use 20M bits/sec.
With 20Mbits you would get only 1bit resolution, and since we're talking about analog data that's not enough. If we went to 12bit ADC we would need 320Mbits/sec.
You make a good point about needing more bits of resolution, but that's only a factor of ~10. I admit that I don't know the limits of the current sensors and rest of the system, but my guess is that they are not at the point where they are maxing out the bandwidth.
I expect that a full-bandwidth continuous surface-level brain scan would exceed traditional bandwidth.
My impression is that having a sensing apparatus to sense and process would be more of a limiting factor. A skull sensor that detects, say 20K neurons, with 1 ms resolution would only use 20M bits/sec.