At GDC this year there was a lot of talk about using the planned Unity3D-to-Flash feature. At this point, the only advantage Flash has over Unity is that more

At GDC this year there was a lot of talk about using the planned Unity3D-to-Flash feature. At this point, the only advantage Flash has over Unity is that more people have the Flash plugin than the Unity plugin. I think a lot of game developers were planning on switching to Unity once the market penetration question was solved by exporting to Flash. Unity was poised to become the no-brainer choice for game development. A few years down the road, the deployed base of Unity-powered games would become large enough that the Flash part could be phased out, like ActiveX was (i.e. slowly and painfully but inexorably). By adding this license fee, Adobe puts a serious damper on that. (edit: people were planning on using Unity for plain old 2D games; the nature of the toolkit is that even exporting those to Flash would run afoul of the licensing requirement)