How about borrowing and lending using MakerDAO and Compound? Or, a decentralized prediction market through Augur? Or, decentralized derivatives through dYdX? On

How about borrowing and lending using MakerDAO and Compound? Or, a decentralized prediction market through Augur? Or, decentralized derivatives through dYdX? Once the Oracle Problem is solved, you'll be able to trustlessly buy synthetic decentralized shares of the S&P500 without using a brokerage. Some people have already done this as a proof of concept.