There still isn't, as far as I'm aware, any software that combines an artwork pipeline and programming so seamlessly as Flash did. Also I'm not even sure if there's a mainstream vector graphics rasterizer out there that is even remotely as powerful as Flash's was/is. Initially HTML5 + JS was so extremely lackluster that I cursed Steve Jobs for instigating this crusade, but I agree it is necessary that Flash dies and we replace it with something completely open.
Suggestion: implement a mandatory uploading fee (like a mandatory transaction fee), which is distributed among the miners who host the files. It should encourage people to dedicate more space to hosting files.