> Macromedia Flash keyframe animation was great even for technical users who didn't know animation. However, as soon as you wanted any kind of interactivity you had to start learning a new scripting language and that was painful for everyone.

Not really. Action Script has always been close to Javascript/JScript.Net and now Typescript, it is the same syntax. In fact ActionScript 3 was supposed to be the template for ECMASCRIPT 4, before it was abandoned.