> You could have good FOSS usability - if you had a central
  > company driving the development. As in Firefox. It just
  > hasn't happened many times so far, because people are
  > willing to pay for good closed-source interfaces in most
  > problem domains.

Actually, Firefox was originally started by two guys as a reaction against the centralized development that was at the time occurring with the Mozilla browser. The Mozilla foundation officially came on board later, well after Firefox gained momentum and popularity.