Well, if it's a good enough story, then I don't see why not. 3D in film form can always be extended beyond the remaining five scenes, and the motion that @Twilight_Roxas mentioned. And if done right, it could be far from just "[cannibalizing] something".
Besides that, Clock Cleaners would be a great choice (nice thinking, Red)! The facade could work nicely with the rest of the land, and the story could create a nice contained thrill not too extreme for a dark ride or younger children.
Yes, but as I've mentioned countless times, I feel somewhat leery about having classic Disney shorts referenced at WDW chiefly by way of the Studios, whose theme is just so... loose right now. Of course, Toontown Fair at MK is gone, so that rules out the MK as my first choice for this kind of section for WDW. But the fact remains that at the Disneyland Resort, shorts are largely referenced at Mickey's Toontown, with just a few references here and there at DCA's Paradise Pier and Buena Vista Street (hence, my original argument for the MK as the main shorts reference). Even so, classic Disney shorts at DCA are not referenced at all in Hollywoodland, whereas Hollywood is the basic theme of the park. Hypothetically, how would, say, the Silly Symphony Swings fit at all in the Studios? It's not going to be added, I'm just asking a hypothetical question for all to ponder.
Anyway, in terms of the Clock Cleaners concept, there is something that I found, so it's not my original idea. It was already put up before, but everyone focused on the wrong parts and made wisecracks about it, so here goes (again):
[M]y idea would be that you enter through an area that looks like the Disney Studios on Hyperion, with a recreation of the iconic old Mickey Mouse / Silly Symphonies sign, it would give way to a black and white area where you could meet some of the REAL long lost friends, preferably in greyscale, Clarabelle, Horace, Oswald, Clara Cluck... maybe even Dippy Dawg [meaning Goofy], Pie Eyed Mickey and Minnie, etc. This could potentially be a fun area to board a dark ride that takes you on a trip through the Disney cartoons from Steamboat Willie through the end of the classic Mickey in Technicolor area...maybe you board a mini Steamboat and begin travelling through the countryside, a barnyard, etc... then a tornado "sweeps you into technicolor" (it's the tornado from The Band Concert...the first Technicolor Mickey short)... through a funhouse room with mirrors (based on the old Pluto cartoon), on a quick adventure with Donald Duck, maybe through the Lonseome Ghosts house - though Lonseome Ghosts might make a good dark ride all on its own- Mystic Manor/Haunted Mansion meets Mickey!) then the ride would let you out in the later era of ToonTown where you could meet the real Sensational 6.
The thing about Dippy Dawg and Goofy being the same character is the thing they focused on and made the most comments about, which is why I put "meaning Goofy" up there in brackets to hopefully stop it from happening again. Anyway, I had thought of the ride to be housed in a copy of the Hyperion studio building, but the theme of the Hyperion studio would clash with the rest of the land because it involves animated characters coming to life from ink and paint, while the theme of the land should involve Mickey and the gang as real people (hence, the hotel). Wouldn't that be sort of contradictory?