I think honestly Canonical is just "pulling a Redhat". Redhat walked away 20 years ago from the consumer market to focus on the server market (Fedora came much later.) Server is where they make money. They don't get any money out the video game market. The users don't give them any money. Neither does Valve. Nor the game developers. Nor the hardware developers. They need money to develop and maintain stuff and grow. They might reconsider if there is push from the server customers though.