I get Uni Studios comms very good from my place....and listened during the morning of the fire. It was bordering on chaotic. I heard them telling every channel the park would be open at 12 noon, then 2pm.... I truly believe they did intend on opening...plus they had parking and other channels dealing with the MTV Video Awards, which were loading the day before and during the fire...and went off without a hitch.
Plus they made an effort to open up CitiWalk to give the stranded guests some other options while they waited around (and to eat, or spend money)... The main drive from the 101 freeway had LAFD hoselays that reached down to Cahuenga Blvd...which looks to be .64 miles using Google Earth....
As for studio operations, there were some production companies near the burned area that were still not allowed to return to work on Monday. The tour, however, was rerouted a little give visitors an ample opportunity to view the scene and take pictures (and cheer firefighters )