When I first read about the complaints by taxi drivers about DME, it felt a little odd about the timing. First, it's October, traditionally Disney's slowest month. The parks are practically empty. However, October is also traditionally one of the busiest months for conferences and conventions, and Orlando is expected to have a bumper year in this area as a lot of conventions slated for New Orleans had to be moved elsewhere and Orlando took up a lot of that extra business.
I think the real reason why the taxi drivers are complaining is not so much about the business they're losing from Disney, but to try and dissuade the Convention Centers in Orlando from doing the same thing. I'm sure there are more than a few people in the industry watching Disney's little experiment and since it's working out so well, it must be scaring the taxi drivers in Orlando.
Not that I'm a big fan of the taxis in Orlando to start with. Most have no meters at all, and the driver simply tells you how much he's charging you once you get to the hotel.