The biggest challenge for open source is that as it enters the consumer market, as projects like WordPress and Firefox have done, you have to create a user experience that is on par or better than the proprietary alternatives.
Matt MullenwegTechnology is closing the gap between what one can imagine and what one can do and as a result the equality of opportunity is unmatched in human history.
Matt MullenwegPeople might start with LiveJournal or Blogger, but if they get serious, they'll graduate to WordPress. We try to cater to the more powerful users.
Matt Mullenweg