I don't think the audio-only format lends itself to programming instruction, but they can be good for exposing someone to high-level concepts, new developments in the field, or discussions and debates on programming practices.
If you had gotten in 6 years ago, you'd probably regret selling it all 4 or 5 years ago. Or perhaps you'd regret not selling, if the bubble pops tomorrow. Hindsight is 20/20.
It's strange, I work in engineering, and all the most talented and highest paid people are in their 40s and 50s. I guess ageism in the Valley is real, but it seems most prevelant in web-related companies. At some point in your career, working in a start-up of beer-chugging bros or in an office that looks like an elementary school loses its luster, and you find better opportunities.
In fact, I'm finding more and more libraries written for Python 3 exclusively, or for which Python 2 support has been discontinued. Stating "you may find a lot of packages that only support Python2" makes me think the author is just spouting off random things he's heard.
If you want to attract talent outside the Bay Area, pay better. Even with the insane cost of living, I still end up ahead financially when I've compared to other places.
I once interviewed with a team leader and two of his engineers. When I asked "What qualities characterize a valuable member of your team?", one of the engineers described how hard they work: they work so hard that the team leader cancelled dinner with his wife on their 10th anniversary so he could work late that night. The team leader was beaming with pride. I felt sorry for all of them and especially for that guy's family.