Actually there were no HTML5 stuff shown in the demo, I can code those effects to work with IE6. In fact that demo may even work in IE6 if you would include some hacks.
So Adobe probably understands the issues of open/closed better than anyone, and has an organizational structure that has proven able to adapt to it.
[ Though it's worth noting that MS made an incredible sacrifice to ship windows for netbooks at a massive discount, to fend off linux. Although I use a linux netbook myself, I have to admire their foresight and fortitude. Another company is Intel. Although I don't have a specific story for them, Andy Grove wrote a book Only the Paranoid Survive, and also has a blurb on the cover of The Innovator's Dilemma ("lucid, analytical - and scary" he says) - they know the danger, and have lasted a long long time, as the driver (and proposer) of Moore's Law. ]