I hear what you are saying but also think about it this way:
It isn't only about capacity, but also about distribution. If the same crowd is better distributed throughout the park it means shorter lines, happier guests, and ultimately more spending. If people don't feel crammed or hurried they are more likely to spend. The suits like that part and it is a critical part of getting any project greenlit (Disney or real world).
There is table service on Main Street (2 locations), Liberty Tree, and CRT. A table service location in Adventureland would help distribution in a myriad of ways. It would activate the street with diners and people waiting necessitating more retail. If done correctly the dining location could be an attraction in it's own right, providing freshness to the area. The park could use a heavily themed dining experience other than the girl centric CRT.