The solution to the DHS identity problem isnt trying to find the park a new identity simply because it's no longer a working movie studio. I believe the best way to fix DHS is to bring the park back to its roots. While real productions may no longer film at DHS, there's no reason that the illusion of productions filming on location can't be maintained. After all, isn't that what a Disney Park is all about? Illusions?
With that in mind, I think it's time to restore, not get rid of the Backlot Tour. New set pieces need to be built and "productions" need to be "filmed" there. I also think it may be kinda cool to turn the tour into a Jungle Cruise style ride, with sarcasm and Marc Davis humor added throughout. Also, to kick the tour up a notch, you never know what will be "filming" on your ride. Perhaps a set will be used, perhaps it won't, and it's possible to have multiple productions film at different times on each set, adding more varriation to the ride.
Due to a lack of space and PixarPlace, there's really no easy (or cheap) way to do this. The best bet would be to move Cypress and S Studio Dr, and expand that way. Reroute the tour so that it goes down a newly rethemed 1920's NY Street (as it did in the original tram tour) adding motion and excitement to that area of the park (of course some things may need to be moved around, and a few new paths/a possible bridge may have to be constructed for guest flow, but I think if done right, it would be possible to keep the MV3D ctyd open and still have this done). Of course as you drive by you may be interupting production of a picture which is "filming".
Next up, the Lights Motors Action area. LMA really is kind of a waste of space imo, and is inferior in just about every way to the Indy Stunt Show, and so I personally say do away with it, but keep the set up and make a road for the tram tour to follow onto the set, where occasionally live actors (playing directors, film crew, actors, etc) will be filming a new action movie located in a European Town. Some of the scenes in LMA will be included and filmed right in front of your eyes with you right next to the action. Then, in the newly expanded area of the park, perhaps a Western Set could be constructed, along with an Adventure set, etc, until finally you reach Catastrophe Canyon and the Grand Finale.
The other major expansion I would add to the park would be an expansion of the Muppet Ctyd, with some sort of a POTC-style dark ride (whether that be the Movie Ride or something new), a Restaurant, and LCI meet&greets.
While we're at it, reopen the Hunchback theatre as a new indoor Broadway Theatre presenting an upgraded Beauty and the Beast with costumes and songs from the actual (now closed) broadway production. Of course a new show would open in the current B&B's theatre on Sunset Blvd. Perhaps expand on the 1920's NY area too, now that S Studio Dr has been pushed back and SF st has been rethemed anyway...open a new "New York Rooftop Restaurant", where thanks to facades movie magic, it'll appear you're dining atop a rooftop in 1920's NY and a Soda Shop to go along with the Broadway Theatre...
I suppose my plan to save and expand the Backlot is pretty unrealistic, but I'm not sure where else the park can be expanded. Obviously Pixar Place needs at least one new attraction, and there's some space for perhaps a few things behind the Animation Ctyd I suppose...and of course the Parking Lot behind Indy. Idk. DHS is so difficult due to location and space...perhaps I'll draw a quick masterplan of the changes tomorrow when I have some spare time, just to make things a little more clear.