"Producers of information goods" is a far broader category, including authors, musicians, movie and software people; and one not superceded by something more practical, unless you consider twitter a good replacement for books.
And government protection to create a market is a fine idea - it's in the US constitution, for example. It just needs rebalancing.
I am also not arguing against all instances of government created markets, by the way. Just saying that failure to be able to make a living in a way that people used to does not by definition necessitate being saved by the government.
To me that is confusing, because in my mind distribution is a different act than creation of information goods.
Movie theaters, dvd's, netflix.... those are distribution, and I don't care too much if new ones arise and old ones go away. But I enjoy a movie once in a while, and would be sad to live in a world where it is no longer possible to do anything but the cheapest of indy efforts.
There may not be proof either way, but if people do not have to pay for information goods, it only stands to reason that there will be less of them produced. Certainly, they won't go away entirely, but why would anyone produce a movie like Avatar if there is no legal way they can get paid for it?