Yes, Flash has finally had its day. It will be remembered as being a major part of the web's history, with most multimedia sites on the web using it. Sites like YouTube depended on it completely for their existence for a very long time, but things have now moved on, and even Adobe have recognised that.
Because of its success and ubiquitousness for so long, Flash was a prime target for exploitation by hackers, and you did get the impression that Adobe were constantly fighting a losing battle to try and keep it secure.
No doubt the hackers will now move on to other potentially vulnerable web technologies, maybe even HTML5, but they won't find such a soft target as Flash again I suspect!
As I said HTML5 seems to work fine for me on Opera 12.18, both on Windows XP and on Windows 10.
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