Not only is this politically impossible in the US, it would never be able to be equally applied across the industry. Startups would still give a raw deal to their employees. Startup culture in California practically worships extreme hours and periods without pay as "dedication" and part of the "grind".

Furthermore the fact that programming can be fun enough for lone wolf hackers to do their open source projects for free means that unionization efforts would probably lead to a greater industry reliance on actual free work, not less.