The point Dave makes in the original post, is that he sees new flash content being produced, so the boycott is not working. I think it is more productive to focus on promoting html5 to make flash irrelevant.
Of course sites are still going to produce content in Flash, but nowadays they at least have to consider that by doing so they're making it impossible for an ever increasing market segment to view their content.
I ran Debian on a PPC machine a few years ago so I couldn't use Flash. Back then only very odd setups like that didn't have it. Nowadays millions of people are buying new top of the line devices that don't support it, so the tide is turning as a result.
I think both systems together would probably work best. Because---and here I link to the original article---the fight is far from over.
If Flash will eventually disappear it will be slowly, very slowly. Companies are reluctant to get into new technologies. Has DVD disappeared because of Blu-ray? Has Windows XP disappeared because of Windows 7? What about Internet Explorer? And it's the same outside of the tech industry too.
Some sites will be early adopters, some will be slowpokes and most will be somewhere in the middle. And in this last year we've seen a _lot_ of mindshare being gained by HTML5. For a start Youtube, Vimeo and friends. Let's remember that a couple of years ago Flash was basically had the whole market by itself.
I don't know if the iPad/iPod helped, but I do know that Flash is starting to lose its grip. And yes, of course people will still develop on Flash for many years to come, the same way some companies were still selling VHS players a couple of years ago. But the adoption is gaining steam.
There's a lot of people who know flash and don't know HTML5 and not to mention HTML probably having some shortcomings.
So there's going to be stuff done in flash to appease the designs of sites. But once HTML is more mature, and people know how to use it, they're not going to do the work twice anymore.
Make no mistake, having a major platform like the iPhone/iPad is pushing that forward. It's hard to tell how or when this will turn out.
I ran Debian on a PPC machine a few years ago so I couldn't use Flash. Back then only very odd setups like that didn't have it. Nowadays millions of people are buying new top of the line devices that don't support it, so the tide is turning as a result.