As a an academic contributor to a mathematical software project (much less mature than Sage), I want to thank you for giving this talk. Hope it starts a much-needed public discussion about this topic.
Best of luck with the talk! I'm way out in the hinterlands of your world but it struck me how small this world may be: as an MD doing some applied ML stuff out in San Diego I have actually troubleshot a bug with Fernando Perez, and know a few other folks from the early days of what became Jupyter.