To put things in perspective, here is a question.  What will happen when China can no longer under price its exports?  In other words, when China cannot produce anything for much cheaper than anyone else can, what will happen to their economy?

It is just a matter of time before China is no longer able to sell its products cheaply enough to compete with other global manufacturers.  First, the inevitably and ever-rising yuan is making its exports more expensive year by year.  Second, the coming labor shortage set to hit about 2015 will drive wages up and cause chaos in labor markets, further increasing the price of exports.  Third, scarcity of resources, making China increasingly import its resources, is likewise putting upward pressure on costs of manufacturing.  Fourth, while global manufacturers have had to implement innovative techniques into their production methods in order to compete with Chinese manufacturing over the last few decades, the Chinese manufacturers on the other had have not, enjoying the benefits of cheap labor and cheap resources to provide for their competitive edge. Thus, over the last few decades, a plenitude of inefficient, wasteful bad habits have seeped into many factories' production lines.  Fifth, the effects of pollution, corruption, inflation, and income gap disparity has not only further exacerbated production costs, but more importantly created in the Chinese consciousness a rather bitter attitude towards this so called period of "economic prosperity" that seems to have prospered so few at the expense of so many, thereby elevating the fears of the central government of social unrest and further increased costs in having to clamp down on the increasingly belligerent masses.

Now, after costs have increased, and after it is clear that there simply isn't enough domestic demand for Chinese-manufactured products due to ever-disappointing domestic consumption rates, Chinese manufactures will become increasingly hard-pressed to be able to sell goods at a profit in their own country and abroad.  Chinese manufacturers face further costs in having to implement last-minute efforts in transitioning their production lines fast enough to be able to compete with global manufacturers who have over the past 2 decades been cutting costs by implementing innovative, efficient changes to their production systems and have been doing so without lowering wages too much.  It may very well be the Chinese who initiate the coming trade war when they will have no choice but to impose tariffs on goods imported to their country.

When Chinese manufacturers cannot then sell their products in their own country, and cannot sell them in other countries, and it becomes clear that the promises of central government to provide for future prosperity for the Chinese people of they sacrifice themselves by working hard today is proven to have been a false promise, what sociological effects are to be expected, I wonder?

You actually think China will ever become like Singapore?

There aren't enough resources on planet Earth for that.