Hmmm. I wonder what exactly will be the benefit of this apart from that the battle will change from battling vulnerable plugins like flash, java whatever we at least had some control over to fighting malicious HTML5/XML content within the browser itself.
I know what we could do... pure text, pure links, no real interactive contents and download everything even download only for films and commercials we would like to see and only download for sound etc. thus probably be way safer.
The ultimate best is the dumb all manual terminal, case closed we're pretty much safe. - and so on - Do we want it?
We know the answer - NO, we do not want it. On the contrary, we want interactive contents, we want convenience... and by that approach, we also say yes to be vulnerable in terms of malicious interactive contents.
A known vulnerability is no problem to handle for all the know-how techies, heck it's known and so it is no problem - The unknown on the other hand...
I am for change at all times, but I think they move too fast on this subject and that rushing it is only going to get back at us.
Oh well, Adobe abandons the Flash plugin, Java abandons plug-in.
Sure is a lot of obsolete multimedia, games and other interactive contents in a few years - and my digital toolbox will yet again have changed radically.