Assuming you’re the first to explicitly point out that lemon market type of feature of ‘random social interaction’, kudos, I think it’s a great way to express certain extremely common dynamics.
Anecdote from my country, where people ride trains all the time, fitting your description, although it takes a weird kind of extra ‘excuse’ in this case all the time: It would often feel weird to randomly talk to your seat neighbor, but ANY slightest excuse (sudden bump in the ride; info speaker malfunction; grumpy ticket collector; one weird word from a random person in the wagon, … any smallest thing) will an extremely frequently make the silent start conversation, and then easily for hours if the ride lasts that long. And I think some sort of social lemon market dynamics may help explain it indeed.
Would really really love to replace curricula by what you describe, kudos for proposing a reasonably simple yet consistent high-level plan that at least to my mostly uneducated eyes seems rather ideal!
Maybe unnecessary detail here but fwiw, in economics in the Core Civilizational Requirements,
I’d try to make sure to provoke them with enough not-so-standard market cases to allow them develop intuitions of where what intervention might be required/justified for which reasons (or from which points of view) and where not. I teach that subject, and deplore how our teaching tends to remain on the surface of things without opportunity to really sharpen students’ minds w.r.t. the slightly more intricate econ policy questions where too shallow a demand-supply thinking just isn’t much better than no econ at all.