The average price for an adult CS meal (including beverage and dessert) is about 9.00-16.00. A child's CS meal is about 4.50. The entire
day's price for the kid's dining plan is 9.99. It does not make any sense at all for one kid's CS meal to possibly exceed the cost of the whole day's plan, which also includes a snack up to $4, AND a TS meal, too.
If the kid's meals don't have enough food or aren't choices your kids prefer, you can always buy an extra item or two to round them out, or share some of your adult meal with them.

There are a few CS restaurants that do not have kid's menus, so you could plan to go there. And as brymolmom suggests, do your research because there are some different kid's choices out there, too -- it's not all chicken nuggets.
As far as TS, if the kid's meals don't look appealing for your children, then stick to buffets or restaurants that serve "family style" -- your kids will have all the same choices as adults, and whatever portion sizes they want. There are a lot of choices: Trail's End, 1900 PF, Chef Mickey's, Boma, Tusker House, Cape May, 'Ohana, Crystal Palace...