My experience is that once government gets a surplus someone always will find a way to spend it. The reason so few Americans are wealthy isn’t because it is hard to earn enough to be wealth, but because it is so very, very easy to spend too much.
If the state continues in this direction, decreasing government, thereby decreasing income tax needed, and dedicating surplus to infrastructure conducive to business investment, and eventually getting rid of income taxes, they could have a long stable future.