Now, I don't see the current TS options as bad, but that doesn't mean I can't think of new ones to go alongside
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One thing MK is really lacking is non fixed-price meals for dinner. There are only two (Plaza and Tony's) and neither of which is really a special meal. Also, all current (and planned) TS restaurants basically sit along a line straight from the entrance through the castle, then up into FL, adding something in Adventureland and/or Tomorrowland would help to spread that out a bit. (Even LTT is close to this line)
Adventureland is easy to come up with a theme/cuisine and I'd love to see a TS here with Carribean/Central American flare (more than just Tacos and Burritos!) They could theme it to tie in with Pirates pretty easy, and theming in general could be done without much effort to keep it fitting from the corners of Frontierland (Spanish Mission/Fortress?). The problem is space, there isn't much room left between the park and the backstage areas.
Over in Tomorrowland, there's plenty of room on the other side of the tracks either north or south (with some filling in of the water there) of Space Mtn. The problem here is that no theme/cuisine jumps out at me, and MK already has the "standard fare" covered with The Plaza.
Now, I know the OP was just about MK, but I'm going to continue on to the other parks
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Over in Epcot (yes, Epcot, the park with 500 TS locations!) there is a niche missing in Future World lunches. Opening Garden Grill for lunch may help with that, but that's not very creative now is it? The issue is, the only type I can think of would be a primarily vegetarian place (something lacking on a whole), but that would really only fit The Land, which already has Garden Grill. Maybe do something with all the excess space in the Imagination Pavilion, something akin to the Animator's Palette on the Magic (minus the stage show).
Would also like to see The American Adventure get as TS meal (it's the only country without one, though I'm sure there was a reason for that, probably in the same vein as the reason there was no PoTC in WDW at first...). Toss in a mix of iconic foods from around the states (St. Louis BBQ, New Orleans Cajun, New England Seafood, etc). The mix of different localized foods would be the key here, to reprsent the diversity of the country. (I know this idea has been tossed around a lot).
Heading over to DHS, they just need something good
. Seriously though, I'm pretty sure that one of the old soundstages near TSM is being used for storage (and maybe even temporarily). Perfect place for a 3 meal (B,L,D) Pixar themed meal. I'm sure this would be a huge hit and would tie in very nicely to the current theme.
Last, we have AK. This is another tricky one to fit in with theme and cuisine. It would certianly have to be a bit more on the exotic side to fit with the current offerings, but the two remaining locations don't really suggest anything at all. Expansion here would be easier than the other parks though, as there's a ton of land that's available with little to no backstage "reoganizing" that would have to be done (that swath south of Camp Minnie-Mickey, behind RFC, or the large area North of Everest are two examples). An
Amazon style area would work well someplace (for geography's sake, probably in that Camp area rather than north of Everest), or even something based on the Galapagos (granted, they couldn't import animals from there, so that may also not work.)
At any rate, there's a lot of areas where Disney could fill missing gaps in their offerings and as the parks get busier and busier, they're going to have to either open another gate (huge cost, but huge gain) or expand other existing parks (less cost (still huge), less gain (still sizable)).
