Good for China
By having such fast trains people will be less likely to use cars, and buses. That means less air pollution.
People will get to their destinations faster, and be more productive.
The USA can take a lesson from the Chinese on this. If we had fast trains like this in the USA, less people would fly, and subject themselves to the humiliating and worthless hassles of the TSA.
Board a train in New York City and arrive in Orlando (Disney World) in the afternoon. No strip search at the airport, or goons grabbing your privates. And you can even bring food and drink without a hassle.
As for the stupid comment by EatingHay... if you don't like Chinese made products then don't buy them. Pay much more than you have to and support organized labor in the USA.
They would also be less likely to drive the long distances they do when they can take a train.