>Let's assume there are around 100 cable channels showing content in HD video 24/7 (with no overlap, there are more but a lot of duplication). That's 2,400 hours of content a day, 876,000 hours a year or 101 years back-to-back worth of watchable content shown each year.

I'm thinking that 100 channels provide exactly 100 years worth of content per year instead of 101. Unless you rewind the good parts :-p