What would the government do?
The communists are well aware of this possibility, or the more likely smaller but numerous demonstrations.
In preparation for the Olympics they are now rounding up and jailing/killing those who might try to put up a demonstration of any sort during the Olympics when the world is focused on China.
They have internet police active as well to find any dissenters. Since Tiananmen they have been pro-active in stopping any such activity before it would even begin. This is why contrary to what many say, what we would refer to as civil liberties have actually decreased over the past 15 years.
Most of the up and coming "capitalist" younger princelings unanamously support the Beijing Party Line and relish becoming CCP bigwigs. Aparatchiks wearing Gucci ....