About this problem, i dont think that such things would happen. Singapore is such a small country where conflicts are extremely easy to control and the PAP has total control of one of the smallest nations in the world. From changi to Tuas everything is the same. people are not divided by physical regions or culture. even a kid can run singapore.
The collapse of singapore is happening already.It comes from within the establishment. soon, it is inevitable there would be non-violent changes as a new group will emerge. How much participation the people on the ground want in these changes will depend on them. they can bo chap and soon we will go back to the old dictatorship of the PAP.
I dont think that there would be any protests or demand of the toppling of the government. In singapore, even if the government is bad, the people still know. Laws are laws, they are here to be followed. That is why our country is probably the best country in the world.