People using the likes of Unity or UDK to create Flash games would not need the Flash tools. Adobe's Flash division simply does not sell tools to create the kin

People using the likes of Unity or UDK to create Flash games would not need the Flash tools. Adobe's Flash division simply does not sell tools to create the kind of content that requires 'advanced 3D' features. It therefore makes sense to expand their business model to include their most successful product (the Flash runtime). I think it's absolutely fine for them to try that, but going for royalties rather than a fixed fee may just blow up in their face.