In like 10 or 15 years from now, you have to go beyond the facts. Ok we know that you need a decent Internet speed let's say at least Cable (most companies will give you 7-15Mbps depending on the area) because DSL is just too slow to download a 4-8Gb file so in order for downloads to take over Internet providers need to open up the bandwidth which they are doing the completely opposite! Comcast is limiting people to 25GB per month and TW is testing a 50GB per month fee and every GB over 50 is a dollar in TX, so with this business model why would you pay let's say $8 for a download that is 7GB, 8, 9 or 10 and take most of your bandwidth for the month when you can spend 20-25 for physical media?
I've had countless arguments with some dude here at work, this dude talks about a future with everything on demand no physical media everything would stream and my argument is always the same, where is the bandwidth? of course if companies wanted it the ISP would consider lowering fees I am sure, but physical media takes 35-45% of a studio's revenue it's not going to happen, it hasn't impacted disc sales it could if everyone was running FIOS at home with 20GB for 64 bucks a month, but unfortunately we have those stupid provider zones so it ain't happening.