Sure, the powerful will want to keep it to themselves, but so did the nobles in the medieval ages. Eventually those with decent intentions luck out into positions of power and are able to spread some of that hoarded power to those who were previously denied. Our power solidification and disparity has acted like waves with high tides and low tides throughout our history. When enough power gets hoarded, those societies stagnate, allowing societies that were behind them and willing to take risks to shoot ahead of them displacing the old powers, and then the cycle repeats