Housing in Japan is kept sensible in large part thanks to their land value tax for real estate.
When prices are high anyone who owns has incentive to prevent the supply problem from being fixed.
Unless… you have a land value tax
Their housing prices are being further depressed by the fact that they're now dying off fast enough that even Tokyo's population is starting to significantly decline. And that, in turn, is further compounded by a prevalent superstition in Japan against living in a house where somebody died, which helps to further reduce demand for many housing units that 'become available.'
Now it's rather the opposite. If you go to Japan on a Western salary (and especially after converting Western currency post ~2022), everything's dirt cheap for a foreigner, yet quite expensive for locals, which is much more akin to the economic state when visiting a developing country.
And so saying housing is cheap in Japan is kind of crass in a way. I mean yeah obviously it is, so long as you don't happen to live and work there.
No such mechanism happens in education, once you have your degree it is yours forever. There is no secondary market. If the value goes down, sure, other people will not pay as much for new degrees, but there's no direct connection between the market value and the tuition. There is no reinforcement loop.
And especially in the era of the internet the concept of college being a necessity to educate oneself is rather plainly artificial, and it's also highly debatable whether the current GPA inflated profit motivated degree treadmills that colleges have turned into is even providing a meaningful education.
A connection, yes, but not a feedback loop. A drop in the value of a degree does not lead to everyone panic-selling their degree.
What you're describing is simple ROI---as the return on the education investment declines, people reduce their investment in degrees. But falling tuition does not further reduce the ROI, as in the case of housing where there is a general expectation of appreciation, and therefore, speculation.
Ever inflating house prices are caused by high demand and ease of access of debt. It predictably leads to endless price appreciation until you fill the bubble up enough to burst it, then we simply repeat again. Same thing happened to education. It's a 'commodity' seen as priceless and the government ensured access to endless debt to purchase it. You'll never guess what happened next.
[1] - https://blog.gaijinpot.com/what-is-the-average-salary-in-jap...
[2] - https://en.wikipedia.org/wiki/Personal_income_in_the_United_...