[Ernesto]

Many PR are not permanent, need renewal in every 5 years.
Normally will be rejected once out of job or business for a period of times..

Singapore PR application approval has a annual qouta and base on a set of criteria. But no clear path to qualify. 

At present, it is difficult to acquire. It is possible that our population has reached its maximum capacity.

Well PR is a recurring application. So some come replacing those gone but their rental price and asset investment speculation damage the heartbeat or soul of the country is permanently.