I doubt streaming will ever kill DVD's or BluRays. New physical formats will, but there will always be too many people who prefer a physical copy for the companies to ignore. Too many people who prefer a physical copy to the worry of losing everything they purchased if the streaming service closes. Look at Sony, recently they closed their ebook store though they did transfer their accounts to Kobo. If they didn't do that, would people who had books by them ever be able to get them again if anything happened to their ereaders?