Well, increased/improved technology can be a double edged sword for both the customer and the call center.
There could potentially be a point where Disney improves their website enough to handle large # of reservations (though going on their current system, that is no where close to soon). If they do so, they could go the route of other reservation places (AA, etc) who offer free online booking but charge for booking through a call center. This would, of course, great diminish the number of calls received.
On one hand, that would alleviate the stress on the call center staff, but it would also reduce the need for staff. So, with a diminished staff need Disney would be able to be more selective, hire better workers and/or treat their workers more like employees and less like work horses. But again, that means layoffs and less work available to the community at large.
On one hand, the customer would be empowered to make their own reservations and ensure they're getting what they want (and if not, it's their own darn fault). But on the other hand, if there's a problem, you're confused, you really just prefer talking to a human and hate dealing with the internet, now you have to pay for this service and deal with technology glitches or slow load times during code/rate releases, etc.
Darned if you do, darned if you don't.