I just looked this up for you, If it were me......I think If they continue to say they are still stopping in Mexico, I would change my trip. I would wait for as long as I can to change it to see if they skip Mexico. Sorry.
Any people are wondering if Disney has issued any travel warnings or advisories regarding travel with Adventures By Disney or Disney Cruise.
Currently, Disney has not released any advisories or travel warnings. Their western Caribbean cruise does stop in eastern Mexico. So far, the swine flu in Mexico has not spread to this region, however, that's not to say that it couldn't in the next few days/weeks.
The Adventures by Disney itineraries for 2009 do not travel to the Mexico area.
As with all situations of this nature, Disney will likely be overly cautious and avoid the Mexico stop, should the disease move into that region. Until then, make sure if you're traveling anywhere internationally to keep an eye on all CDC travel recommendations. Currently, the CDC recommends against any non-essential travel to Mexico.
All cruise ships, including Disney's, have taken extreme precautions to ward off any diseases. These precautions have proven to be effective in mitigating all diseases aboard ship. In fact, all cruise ships that visit U.S. ports are subject to periodic unannounced inspections by the CDC’s Vessel Sanitation Program.