Re: Teaching Children Aikido
I'm with Anita on this one... Teaching kids for the wrong reasons is not a good idea. As for "day care", you are bound to have some kids who want to play, as well as some parents who are looking to dump the kids on somebody else for a few minutes. It goes with the territory, so if your instructor hasn't got thick enough skin, he's going to be unhappy, and it will show. Excluding everybody who isn't totally focused on training will probably result in numbers too low to be profitable.
I suggest a compromise. Limit enrollment to kids 10 and up, and make it a program that they will feel proud (and motivated) to participate in earnest.
If you'd like to model your program after a successful one, seek out Auge Sensei of Yoseikan.