We have a very active and vibrant kids program at our place. While adult attendance has suffered somewhat and is quite variable, the kid's program is always bustling and busy. There are only a few of us who teach or assist with the kids, however, as it is really important to have the right people there. And if you don't like kids it is the last thing you should be doing.
If the kids program is any good it will tend to grow on its own. Most nights the mat is full of the screaming mat monsters, at least for the first hour.