The Tram Tour,, Armageddon and the Stunt Spectacular all need attention before going near ToT, which still works as an attraction.
Given that it's all a fake backlot anyway, it has no value. Frankly, it should never have been built in the first place.
As much as a proper studio tour would really tickle my fancy, I think with Disney's current outlook they should look at removing the current tour and see how they can fill that enormous space with whatever IP-related magic they have up their sleeves.