Well, in fairness... If someone can get Quake 2 working in HTML5, I'm fairly confident that "Super Mario Crossover" isn't going to turn out to be some new form of rocket surgery.
The "old videos" argument I can empathize with, but it's not like we'll never find another way of creating online entertainment again. I'm sure there will be fade-in, menu-driven websites with bolt-of-lightning mouseover effects in the post-Flash world too.