Nobody ever promised Bitcoin as a solution to wealth imbalance. It doesn't solve that problem. The problem Bitcoin solves is transferring money quickly and cheaply anywhere in the world and, also, providing a cryptographically secure store of wealth that a government can't arbitrarily rob.
The OP might be right that we the little purse holders are the 15% but it doesn't change anything as there are a lot of fiats distributed among a privileged few who have managed over some time through their business and influence to accumulate them.