The Federal Home Loan Banks have seen the future, and it seems to involve fewer surviving institutions generating most of their revenue by buying mortgages from members. In fact, the FHLBanks of the future may look a lot like Fannie Mae and Freddie Mac. That’s a future vision policymakers and the FHLBanks themselves are likely to debate a little more actively in the months ahead as the result of the FHLBank of San Francisco