I was never sure if those ads were tongue-in-cheek or not. Either way, not a good way to stand by your customers. The way flash is talked about, you'd think it was a terrorist sympathizer who couldn't produce a birth certificate. (I could draw a lot more parallels there ie. how we got into this mess but I wont)
Adobe fault was not in that it failed to invest in a solution, its that they spent time and energy poorly and ultimately failed. They could afford to negate the legitimate complaints about flash and proved incapable. There are many people including engineers close to the core who's hearts are broken and wont forget this anytime soon.
Flash, or moreover, the idea of flash has the aptitude to achieve world internet peace. Write once, run anywhere. This is how it should be but those who stood in the way proved it's as elusive as actual world peace.
As a plugin, flash has a bleak future, not due to irrelevance. If it were re-imagined as a core engine like webkit (flashkit?) with all the same hardware access it would be very difficult to deny it. Hardware manufactures, be it car stereo or wi-fi enabled refrigerator would no longer have to get in bed with android or pay for a custom solution. I would love to hear the argument for javascript over actionscript in that situation.
Never forget, javascript is the Mitt Romney of languages. It just happened to be everywhere and people just settled.

Maybe one day we'll see a common sense approach to multi-screen but until then our learning curves just got very steep. Frankly I'm too exhausted.