I've got several flights on NW (including one set to WDW in Feb 06), and I look at this as a *good* thing for the airline and eventually its customers, though a bad thing for its employees. NW needs to restructure its labor and pension costs to be viable given the current airfare market, and the unions have not been willing to do so. Expect to see both the mechanics and flight attendants agreements to be tossed out, as well as a bailout of the pension fund.
It's tough on the employees, but the days of pax routinely paying $600 for intra-timezone flights are over, even for those of us commonly on business fares.