I maintain that video is what made Flash ubiquitous, and thus enabled websites to assume that visitors would have Flash installed.<p>HTML5 removes that advantage, so the installed base of Flash will decrease, causing more and more sites to not develop for a Flash-audience.<p>So nominally, the post is right - HTML5 doesn't replace Flash. It renders Flash obsolete.<p>Remember Shockwave? Also a browser-plugin, but only used for small niches, games etc. Never had the ubiquity of Flash. This is where Flash is going after HTML5.