Now see; this is why the internet is no longer any fun. So many just come here to dump on people. Trying to pump themselves up by putting others down. Sick.
harshness, that's all very nice. (Although what are you talking about 'rationalizing'? You do not seem to know what that word means)
The mention of DOCSYS was helpful as it allowed me to research this, although your belief that frequencies are "a constantly moving target" is wrong. You seem to think this is spread-spectrum like wifi, but it is not. It is wideband, as is satellite. This accounts for how cable has gotten increasingly faster up/download speeds over the past few years. Apparently 120mbps download/30mbps upload service has been announced for Quebec City.
So the answer is that digital internet simply can not be diplexed with sat, as they occupy the same lower freq spectrum (0-1GHz). Although in the case of sat it also uses 1-2GHz for stacking tuner 2, that's not relevant here (yet). With sat freq use, accommodation is made for analog cable channels to share bandwidth allowing diplexing TV2, but the rest of the spectrum is used for video and cannot be shared with today's digital internet.
Are you prepared to move to an area where you think you can make this work?
What a childish question. All along I have simply been trying to understand how this works. Your mention of one word made this possible, and for that I'm grateful, but keep your trash to yourself.