Your point is valid given current market conditions, consumer adoption plateaus, and the sheer pace of technological breakthroughs. However the DRM restrictions threatened by the major companies are well within their capabilities of implementing. DRM can be made to happen given current technologies and does not require a "shared-key" approach. IMHO one of the few things holding DRM back from being effective is the rapid growth of technology and the lack of infrastructure to support client-based DRM.

With the Internet a medium for digital transfer exists. It is not unfeasible to assume that you or I can buy "Internet-enabled" appliances in the near future, Imagine a DVD player hooked into the Internet capable of generating it's own unique keys!