I guess it would. I don't know why DOCSIS 3.1 uses OFDM. DVB-C2 does, too. It may be that it's six of one and half-a-dozen of the a other and as a lot of other systems use OFDM these days, it's easier to design a similar system. eg DVB-T2 (and T) uses OFDM; DVB-C is single carrier, but DVB-C2 is OFDM and very similar to DVB-T2. It makes designing a chip to do both easier and cheaper.
"The addition of OFDM modulation and other coding techniques results in a 50 percent increase in throughput versus QAM channels across an equivalent bandwidth."
Is this only because the guard bands between 6 MHz channels can be slightly narrower?
Use of OFDM is only really called for in environments with a lot of multipath interference. Are they having multipath problems in cable systems? Otherwise, a single carrier scheme like QAM should give measurably lower levels of threshold SNR, so I don't see this unqualified statement that OFDM is desirable in cable systems as a slam dunk. Sounds like another tradeoff that needs to be mentioned, at least in passing.
Jim, it looks like there is a significant increase in upstream bandwidth and a smaller increase in downstream. Am I reading that correctly? Does that indicate a departure from the assumption that most traffic goes to the cable customers instead of from them?