In my opinion I would say 5 to 10 years and you will be hard pressed to find them for sale in the stores anymore. I see DVDs going the route of the 8-Track Tapes, LP Records, Cassettes, VHS and soon it will be DVDs turn to say goodbye including Blu-Ray as well.
Once high speed internet is more common in the rural areas, and we see the newer faster speeds we keep hearing about. We will start to see the Netflix and AppleTV streaming content model become more common. Cable TV - On Demand and Satellite Movie Rentals will continue to flourish as well. We may see a few newcomers in the business as well. Online streaming digital content is the future and here to stay.