My apologies - this site is indeed a masterpiece. The usability is much better than most HTML websites, no need to mention Flash.
But in the sense in which HTML5 is going to replace Flash, I am pessimistic that many websites will go to the same lengths. And where there is more code, there are more possibilities to break in the future.
To be nitpicky about usability of newfangled stuff: Using web fonts disables the built-in dictionary on OS X, both in Safari and in Chrome. (I am so happy that this is one thing Facebook has not yet embraced.)
I don't disagree, but I think this is a void easily fixed with the right libraries and frameworks. Remember the web before jQuery? You couldn't get most developers to touch JS with a ten foot pole...
But in the sense in which HTML5 is going to replace Flash, I am pessimistic that many websites will go to the same lengths. And where there is more code, there are more possibilities to break in the future.
To be nitpicky about usability of newfangled stuff: Using web fonts disables the built-in dictionary on OS X, both in Safari and in Chrome. (I am so happy that this is one thing Facebook has not yet embraced.)