@cks I don't think open source software will go away. The urge to tinker & share is too strong. FS/OSS might diverge from corporate/commercial interests again as the pendulum swings to & fro, but that might not even be a bad thing.
I believe that open source will continue to exist as long as there is one 16 year old kid who wants a database of video game widgets, one gardener who wants a seasonal shade calculator, one scholar who needs timezone conversion data.
The humanity will last.