Trivia - when's the last time Disney built a stand-alone CS restaurant at WDW?
I would suspect just a couple of years, though not a new location, they extensively expanded and remodeled the CS location at the Poly, removing some existing upscale shops to do so. So surely there is profit, if there is sufficient demand.
However, I can't ever see Disney building a deluxe class resort, as the DVCs are marketed, without a TS location. That didn't even fly at SSR, one was added, even with the large selectin of TS restaurant at nearby DtD.
The MK has a desperate need for more CS - lines are often out the door even on days of mid-level attendance. Yet Disney keeps two CS shuttered in all but the busiest seasons. Why? And why is Disney building these horrid CS-sundry combo establishments? The only think I can think of is that CS isn't profitable for Disney. There is a ton demand - so much so that it wouldn't take away from TS. Yet Disney doesn't act to meet the demand.
While there is no denying that the MK CS locations can get very busy, there are also many that are under-utitlized. It really depends upon what they serve. I never saw a line at the noodle station on the rare occasions I saw it open. I've also never seen a line at the Pirate & the Parrot. Now it may be because these locations are open so infrequently that people would rather stick with their favorites, but I've also been to Columbia Harbor House when there has been no line, and only about half the registers operating. I've even seen very short lines at Casey's and Pinocchio's but I've also seen them packed...demand just doesn't seem to be consistent, except at Cosmic Rays and the burger place (sorry, can't remember the name, only ate there once) in Frontierland.
It may be that CS locations at resorts also have varying demand. I know the snack bar at the Contemporary (now the Waves location) was often not very busy at all. I think overall demand for both CS and TS havs increased with the introduction of the Dining Plans. Whether it remains so, if they increase the
DDP prices or gut the plans, remains to be seen.