To generalize what you are saying, society will always consider those things as "property" that add value. Songs, movies, software all add value (for some definition of value) to their users.

If, hypothetically, all software is open source, but differs in its data input, then the data will be considered "property". It is already happening with social networking sites, wherein there is reluctance to share in an open way user data, comments, photos, "likes" etc.

That being said, I think content, being a product of human creativity and imagination, will always have some value in the "property" sense.