So it is hard to say when those cracks appear since the global market is quite a big market and can sustain imbalances for a long time, but then the bigger the bubble the bigger the crash.
Foreigner limits, tax on no. Residents, start of uncontrolled construction - these are only some ways I can think it may break and my ideas are based only on reading the internet, you never know what dynamics come and break the housing. Or they break the world or its money supply.
Not trying to fear monger just saying the dance will end.