Watch how fast people start hitting Comcast's 250GB data cap in 2012 and on... especially after people start trusting online backup providers, Amazon Cloud Drive, etc with their files. That 250GB cap includes download and upload -- two months over the limit and you are terminated for 1 year, even if Comcast is the only ISP servicing your region.
Watch one HD Netflix movie a night and you've used 105GB. Make a daily backup of a 5GB folder to a cloud service and you've now gone over your monthly cap. Goodbye internet. That's what keeps me from using online backup services. If everyone is going to start downloading 4GB DVDs instead of buying software in stores, too, something's gonna have to give.