The market is changing from: create something and try to sell it, to: get paid to create something. This has always been the case for programmers that work for a product company. They agree to a price(their salary) before implementing the software. Of course, this is nothing new, consulting practices have always operated this way. The ony way open source hurts devs is that open source encourages reuse. Devs are paid over and over again to create the same thing. This is a much more efficient(in terms of effort) way to do things. Companies will always need new features and custom integrations. Obviously this does hurt "product comapnies", but do we really care? If we don't need something anymore, let's throw it away. It's wasteful not to.