Zero-commission brokers selling order flow are the new intermediaries. Who will disrupt them?

In October the US market witnessed the Robinhood effect. Schwab slashed its stock commissions to zero, which in turn forced TD Ameritrade, E-trade, Interactive Brokers, Ally Invest, and Fidelity to follow suit over the next few days. Schwab called this the zero-commission brokerage war, on CNN. A week or two later, after Bank of…