We aren't lacking ideas neither content, quite the contrary. And they aren't created out of nothing but that's a whole other discussion I am glad to have in another thread.
The sort of complex ideas to create a movie script or a song are lacking, especially good ones. Just because it's easy doesn't mean it isn't scarce.
Any moron could make a cup, but cups don't have zero scarcity. And its easier to make a copy than a whole story for a movie.
No we aren't lacking ideas for that. There have never been so much music despite it being much harder to make a living on it.
I have played music many many years, and I can tell you from experience that its not something thats created out of nothing. Thats just not how this works.
So if you want to have a real fundamental discussion about this you need to understand how these things are made and what it means to create them.
The idea of intellectual property is no more artificial than real estate property or personal property. In my opinion it is even more defensible than real estate. The IP was created out of nothing by the creator. Land? The universe created it and someone just took it by force.