You're right about our existing OSS ecosystem being a marvel. I'm doubtful though about the merits of requiring software to be open-sourced after some timeframe

You're right about our existing OSS ecosystem being a marvel. I'm doubtful though about the merits of requiring software to be open-sourced after some timeframe though. IME, much proprietary software has very complex build and deployment pipelines and dependency chains and is very difficult to do anything with if you don't have a lot of specialized knowledge. I think it's rare for OSS projects to be successful without substantial effort spent on getting the dev and build systems to be workable for any random person on the internet. So who's gonna do the work to get these 30 year old projects usable?