You seem to be commenting on non-first tier cities in your responses. For the first-tier cities that have the strongest real estate markets, foreigners would be restricted from buying if they don't work in the city, and even non-Beijing Chinese residents must work there for five years, and are restricted to buying 1 home (if they have the local hukou, they can buy 2). That's why I don't think there will be a collapse in overseas purchases anytime soon--overseas purchases are an outlet for the restrictions and expensiveness of their home first-tier market.
I live in a Beijing complex where tiny 2 bedroom apartments go for $1 million US, and every real estate place nearby has ads on their windows for buying "cheap" homes in California, Canada, Chicago, and the UK (which usually are a fraction of the price/meter of expensive first-tier homes).
There is also an EB-5 visa ad I see multiple times per day also advertising how the visa will get you 12 years of free American education for your kids with the visa (which is true), which makes it a great deal because the
international school nearby charges $35,000 to $40,000 US (the price goes up by grade) tuition per year of 1-12 grade. I think you are vastly underestimating how much of a "deal" it is to buy a property abroad.