Yep, and it works. Considering the size and crew compliment of the E-D, I would not be surprised if the designs showed multiple mess halls, frankly, almost like a school or in one of those big corporate buildings downtown. After all, as the old workplace adage goes, "Never eat lunch alone."
There should be one for families, as it was stated several times that kids weren't allowed in Ten Forward.
A second one, perhaps a near replica of Ten Forward on a separate deck designed for families. Two mess halls would be sufficient for a ship with a thousand folks.