I think the general hacker culture of most programmers prevents this. There's an undercurrent of anti-establishment, anti-authority, anti-management, etc... To think that the industry might choose to self enforce a license system seems very unlikely.

I've come to dislike hacker culture. Worst part is that when the hackers succeed with their objectives and take over systems; they become the authority coordinating others and they are often 10x worse than the authorities who came before them. They just focus on extracting money for themselves, pulling up the ladder behind them and building moats instead. There's nothing anti-establishment about it at the end of the day, they just join the establishment and make it much more oppressive for the next generation.