I appreciate the sentiment that leads one to such considerations, but really all I see with no copyright is that creators will be completely exploited and the only people making money from people's works will be corporations who lock stuff up with DRM, or with other IP, or sui generis licenses, or simply through physical gateways like only showing movies in cinemas. I don't see that this would lead to greater access to new media creations (though obviously past media would all be open to use).

Short copyright terms - someone mentioned 20 years max, with registration needed after 5 years. That sort of thing is better, far better than both longer copyright and no copyright.

The maximum term, IMO, should enable people to enjoy for free-gratis in their middle ages the media of their youth and build on that freely (libre) as inspiration to create cultural works for themselves and those that follow. Being able to have open, uninhibited access to one's own cultural inspirations well within one's working lifetime seems ideal to make sure that the demos get something worthwhile out of the deal.

Works restricted by DRM can't enter the public domain and so should be exempt from protection by copyright, though I'd allow some sort of deposit system whereby companies could put un-bound works in escrow, and so still be allowed to get copyright protections.