Hold the water back until it complete collapses and washes away 400 million people and a sizable percent of China’s stolen industrial base? Will that be enough to overthrow the communist government?
Well on the downside, that could be enough to get them to start World War 3.
We haven’t seen Another World War because all of the major countries have too much to lose. Put one in a desperate position with little to lose and we’re all in jeopardy.
Look on the bright side. One of the cities in the way of this thing is Wuhan.