Yeah I know all the places where you can find sprinkles of flash here and there, I was focusing in the uses of Flash that always seem to piss people off or actual vectors of attack. You're right that Flash will keep being installed by default for a long time, I think Chrome approach is the best, to bundle flash in a sandbox and have it set off by default or only when really needed, sadly I need Flash to work on Firefox too so I have it installed updated and by default fiewalled (plugin-container.exe) anytime flash wants to connect to the net, I have to manually approve.
I'm ok with websites that uses Flash for what it was really designed, even for some content that might be better approached with interactivity or a graphic layout. It's a tool that was absurdly overused where it wasn't needed in its time. Jobs slapped Flash in the face with the iPhone and when watery-eyed-flash turned to daddy Google, daddy looked in disappointment and you knew Flash was done.
I think the only thing that was preventing mass adoption of HTTPS as default was the associated costs/return: Cert and IP. Mom-and-pop shops that probably make the most of the .com really didn't see the advantage of it until you need it for setting up payment processing. Now certificates are free or mostly free and SNI takes care of the IP side, setting up HTTPS with cloudflare is trivial for example, all this greatly motivates the adoption. But still, FLASH vs HTTPS adoption history is apples and oranges.
Oh and as for millennial, by some definitions I might be one, 34, but I've been labeled generation X, Y not-remember-what-wankery-in-2000's and now millennial, those tags are created by Marketing so you can rehash the same books and conference tours with the same babble but with new keywords. While demographic studies are certainly of serious interest by marketers the reduction of those concepts until the creation of tags like "millennial" is where you can spot the hack from the real marketer. They are meaningless, and in that regard, I use the word for whats it is: a meme.