That's the thing. They are cool, really cool. And from what I gather, it probably wouldn't be hard to find enough parents in a given area who would send their kids to this kind of day care. So why isn't it happening?
There may be between 500 and 700 forest kindergartens in Germany, but it is individual parents and friends who got them going. Each forest kindergarten has its own story, starting with one or two interested parents and an idea. Most of them are only half-days with less than 20 kids. But that is still enough to work half-time. Ours is full-days and they would never do it differently.
I would love to dedicate my time and effort to building forest kindergartens, making the general concept more well-know and understood. But for now it's one step at a time.