Ah yes, this happens all the time. When my pilot union struck in the 90's, the company hired mercenaries who fired upon us. We took dozens dead and wounded before we gave up.
What is going to happen in China is wage and work parity. The average worker at Foxconn makes a tiny fraction of the wages the same worker would make in the USA for the same work. Further, they are getting tired of working 12 hours a day, 6 days a week. Modern information exchange allows them to understand and compare, and human nature being what it is, eventually they will get what they want.
There will be pressure on companies to raise wages for Chinese workers. As the price of labor goes up, the attractiveness of moving manufacturing to China will diminish. Eventually, there will be a form of equilibrium.
Remember when Japan in the 1980's appeared poised to "own" the world? Everyone was copying the Japanese model... entire books were written on the subject. Eventually the hideously overworked Japanese workers simply said "enough" and the model fell apart; Japan fell into an economic funk from which it has yet to fully recover.