We can’t all be plumbers.. college is worth it. You get access to technology. For computers it was that way until the 90s when you could get access outside of universities. All of the front end JavaScript web apps will be replaced with automation and drag and drop UIs. This will let some people scale but all those code academy kids will need to find new skills.
Computer Science graduates have done well and will continue to do well, although figuring out a post-40s career strategy is a huge necessity. Other fields, other than the specialties? Many will continue to suffer, IMO.
Ageism. Yes, there are 50 year old devs that are on the cutting edge of their field, and still doing well, but by 40 you're looked at with increased skepticism if you haven't made your way into management
It seems like an irrational made up meme that risks becoming a self full filling prophecy. Much like the view that the only qualified interviews are Google interviews.