[mionhe]

The "system" in this case being the guy at the top who has taken all the power.

Please feel free to point to the real world exception, because I can't find it.

[eru]

There's plenty of exceptions. PR China just after Deng was a good exception, and so was the Soviet Union after Stalin.

But they were only exception in the lame technical sense that you didn't have a single 'guy at the top' in charge, but a sharing of power by eg something like the Politburo.