It might lead to people thinking of digital goods as "free", but I don't think that's a bad thing. If a product has already made enough to cover the cost of creation, then I don't see that we have to charge for it anymore. I don't think that means it has to be a race to the bottom though. Things like Kickstarter and Patreon have shown that people are willing to step in and cover the costs for the developer/creator.