You know what, scratch everything I said about ActiveX. I didn't think about it very much (it was so awful, I can't bear to), and you're probably right.
< I don't see much evidence of this. >
Really? To my mind the industry is more hacker-centric than it used to be. For example, there's a spectrum of how open and sharing Google may turn out to be with Dart. Some points on that spectrum are better than others, but nowhere on it is the possibility of an old-school closed-source implementation. That's a major change from how things used to be.
The two technical/cultural shifts, open source and the open web, make for a good trend.
That's why counter-trend action such as delayed-open (Dart), delayed/partly-open (Android, e.g., but other examples are easy to find) raise hackers' hackles. At least for some hackers.
And hackers aside, the competing vendors meeting in existing standards bodies get left out. That clouds the prospects for future standardization, unless (again) based on market power. Which is not there, if the topic is Google Dart (and it is :-|).