"With digital stuff, the reality changes. The cost of "publication"(sharing) is trivial. It can happen, it will happen, it does happen, it will continue to happen, and it can't be stopped.
The laws need to change to reflect this new, modern reality. The cats can't be swept back into the worm can behind the open stable door."
To a very large extent I agree with you. The majors (be they print, film, whatever) have made it their business to exploit just how hard it was to make and distribute stuff, charging a huge premium for their service. As you rightly say, a lot of the old problem no longer exist (although there are some new ones).
And this is why we have the RIAA, MPAA et al trying to push through the likes of SOPA. Their business is against the wall, the firing squad is ready and they are trying to argue that bullets should be illegal rather than move with the times.
So, yes, copyright etc should change but it won't change in the way it should. It will just become more and more entrenched to enforce the status quo (e.g. now lasting 50+ years), create artificial barrier to trade (DRM, region codes) and maintain this years bottom-line (meanwhile the actual content creators will get screwed over and films like "Harry Potter" will be declared loss-making on paper).
There will always be a place for Random House, MGM etc. It will just be different and they are afraid of change.
And this is before we even consider the total dog's-dinner that is the patent system.