^That's not entirely accurate, and I'm a firm believe that backlot tour should stay as long as possible, though it obviously needs to be redone at some point.
Anyway, It really does need to happen eventually, but this is something they can take their time with.
The Working studio theme works very well at the Indiana Jones Epic Stunt Spectacular, for Example, and The American Idol Experience, but the list starts to wind down after that. I haven't been on Backlot Tour, or seen Lights, Motors, Action! in ages so I can't really comment on either of those.
The working studio theme however falls apart in many places. That's not to say that it shouldn't still be themed to a working studio, but they really should make the switch to simply celebrating movies rather than pretending to make them. The thrill of things like backstage at the movies is now commonplace on DVD and blu-ray behind the scenes footage, so it simply makes sense to evolve the parks as the times evolve.
But it's not a working studio. So they need to scarp the charade. The attractions are fine as they are, with the exception of the backlot Tour. You need to have a backlot before you give a tour of one.