Sometimes I get so caught up in Flash video that I forget that Flash does many other things, from serving as the environment for the WeVideo editor to enabling sites like the Economist to present interactive data relating to the upcoming presidential election. If you visit the Economist, you can click each state to see the latest poll figures for the various Republican candidates and click Show Calendar to view the dates for that state’s primary election.
I’m guessing that you could build a similar widget with HTML5, but the tools probably aren’t as advanced as Flash development tools, and you’d have to do Flash anyway, since HTML5 penetration is still under 60%. The bottom line is that though HTML5 is making significant headway in simple video playback in a window, Flash does a whole lot more than just that. And it isn’t going away anytime soon.