sigh... Teppan Edo isn't gone.
If you mean it appears physically gone, it's not. It exists, with no hint of disappearing.
If you mean 'gone from the dining plan', this happens EVERY year. While not aware that the official Plan has been announced for 2011, Walt Disney World announces the upcoming year's Disney-owned participating restaurants, with the outside-owned onsite restaurants coming onboard later in the year.
It happens, again, EVERY SINGLE YEAR. There will be multiple threads on the identical imagined 'devastation'.