Comment by TFYS

You can't really separate wealth and power, they're pretty much the same thing. The process that is going on in the US is also happening in Europe, just at a slower pace. Media is consolidating in the hands of the wealthy, unions are being attacked and are slowly losing their power, etc. You can temporarily reverse the process by having someone steer the car into some other direction for a while, but wealth/power concentration is an unavoidable part of free market capitalism, so the problem will never go away completely. Eventually capital accumulates again, and will corrupt the institutions meant to control it.

A smart dictator is probably harder to corrupt, but they die and then if you get unlucky with the next dictator the car will crash and burn.