I agree with your prediction, but I'm not sure it will be a good thing. With the exception of a few popular domains, I'd say 90% of flash content serves to annoy me and waste my computer's resources. I love using clicktoflash because it filters so much. Imagine if band websites started using HTML5 instead of flash. Instead of a big gray box with a "skip intro" link below it, you'd get bombarded with loud noises and stuff flashing on your screen.
I say this half-jokingly: How long until someone makes clicktoHTML5?