More likely, the servers are just trying their level best to escalate concerns among guests, to try to use that as a tool to change the agreement that their union worked out with Disney. There were indications that there were some concerted efforts along those lines before the contract was approved by the union members earlier this year, but I suppose some folks figure it cannot hurt to continue applying pressure to the system. They don't have much to lose (except their jobs, of course).
Many people figure that the gratuity change will actually improve service, since now guests will have direct control. Give good service, and you'll probably get a good tip. Give poor service and you can be relatively sure you'll either get a bad tip or get stiffed. That doesn't happen with Dining Plan guests this year. The servers are practically guaranteed a good tip even if they do a poor job.
A lot of folks are also very happy that the Dining Plan is not quite such a good deal next year. For the last three years, they've dealt with really horribly crowded restaurants, often encountering major difficulties getting decent reservations even weeks in advance. They hope that these changes will reduce that pressure, and as a result, things in the restaurants will trend towards how they were before 2005 -- many folks feel strongly that the restaurants provided significantly better food and significantly better service, back before the Dining Plan existed.
So there is a balance to these changes. With the bad comes a lot of good, and again, for many people, they see this as leading to a better result overall.