In a future Bitcoin standard, Banks might exist if the market determines that there is a need , but interest rate when market determine will ultimately trend to zero . When banks cannot be bailed out , depending on how the contract is structured, the Bitcoin owner get back what is left of the value of his coin if the borrower project fail and the bank who makes bad loan will ultimately go out of business. As you keep saying Jeff “ it is hard to visualize what will happen if we keep thinking from the current FIAT standard “