I've been thinking, what frustrations have I had in making games or using editors? And more importantly, what frustrations might my wife or kids have in using something to make their own game? You are right. Pathfinding and a visual interface for conditional statements are probably too complex. Fun and creativity don't necessitate complexity. The arrow idea I actually love.
I bought a Nintendo Wii U last night and Mario Maker so I could see what it is like. And I gotta say, so far - it is extremely fun. I'm actually surprised how easy it is to use. That is going to be key. Giving people an open canvas and an extremely intuitive way to make games that are fun. I get it - and I'm hyped! : ) Consider me a VGM evangelist.