I had begun to wonder about this when I saw dtube enter the scene.
As I understand steemit is supposed to be all about encouraging and fostering creators of quality, original content.
So on that basic premise there is no place for the posting of copyrighted work from other creators. And thus there should be no moral dilemma about somehow policing that sort of content off the steemit blockchain.
But theory and practice of course are two different things. Your first option would most likely be the best. But with the current rate of dev development, although this might be a (legal) priority, how long would it likely take to be implemented?
Have we got that much time? Some big kind and smiley music or film publisher might just want to give steemit a good kicking when it is down.
And as in all the best playground scraps once one person has starting kicking the guy on the floor the rest will quickly join in.
The software already exists to do what is needed, so the issue is just organising the payment of the licensing for it and then adding it in to the blockchain logic somehow. It would not be a simple task, but also not one that is too difficult to address either. I feel it would need to become a key topic in the community before action were to be taken on it though.