I spend about 130 a month for my 20mb down 5mb up Fiber internet combined with the phone & TV. That's with 1 DVR & 4 other TV boxes as well as premium extra $ channels. Its actually surprisingly cheap compared the the standard coaxial cable providers I had been using for years.
With channels like HBO, Cinimax, Showtime & other that are (On Demand) which are movies that are streamed to my house already having a pretty decent library to choose from, along with all the game demo's & games that can be downloaded on the consoles, I can see disk being a thing of the past well within the next 10 years or less. just my opinion of course. Not to mention music as downloads as well.