His "me" page explains that he's a database engineer at Facebook, and before that worked on performance-oriented systems and software at Wikipedia. It's part of his job to be aware of the drop in flash costs and employ it where he can while balancing performance with operating costs and expenses. No one is arguing that flash memory isn't as permanent as disks, but it's certainly not as cheap, especially on the scale of data that Facebook has.

Every year or so Stonebreaker feels compelled to come down from his ivory tower to troll industry. Remember a few years ago when he co-authored the paper "MapReduce: A major step backwards" (http://databasecolumn.vertica.com/database-innovation/mapred...)? Nevermind that Google probably processes petabytes of data using MapReduce every day that ends up getting served on practically every Google property. How can he argue with results? Can't we just ignore him?