Except now instead of just disabling Flash, you'd have to disable... what? This is an understandable concern, but at the risk of stating the obvious, HTML5 is

Except now instead of just disabling Flash, you'd have to disable... what? This is an understandable concern, but at the risk of stating the obvious, HTML5 is HTML. Any HTML5 elements that irk you are available for your inspection and manipulation through the DOM. This means that sites that abuse HTML5 can be easily "patched" with Greasemonkey scripts, Safari extensions, Chrome extensions, etc.