I guess Adobe Flash® is finished?

Flash player might gone. But the software/development tool will still last for a while. For animation/ UI etc.
Also Flash CC can be use to develop HTML5 content through createJS framework

It’s not that hard to teach users basic hints for bad sites and malware.

Flash has been a bag of problems way before Apple nuked it from orbit. On the other hand, you can’t “kill” or “finish” software and nothing stop Adobe from making flash a viable platform once again. But its not an advertisement to flash technology when the some of the most popular browser addons are Flash blockers.

But do be fair HTML5 is not exactly light on resources either, the new Gmail Inbox has been overheating my 2010 macbook more than anything else. In the end, the overall architecture of WWW is so fragmented, slow and buggy its not even funny.