Few things require flash to run? Bottom of the barrel online games? I do not call things like R2Games and other companies flash games 'bottom of the barrel' and there are still a hell of a lot of things (like controller support) that HTML5 does not do in the real world.
The bottom line is that Flash should stay though as much should use HTML5 as possible. That said Adobe needs to do a serious rewrite of Flash to clamp down on these vulns.