Flash is one of those things that I will be almost sorry to see go. Not because I enjoyed it, but because I could safely ignore it most of the time: I can disable it, meaning that method of attack/annoyance is completely shut off. When I see my browser showing me something that failed to run because Flash was not turned on, I'm fairly confident that it was something I didn't need to see. Sort of like how our spam filters have been trained well enough that nobody in this day and age still gets e-mails with shady .exe attachments--they're predictable, and Gmail and Outlook's spam filters will catch them.
On the other hand, once Flash is dead, I worry that the invasive crap that made Flash so obnoxious will simply be re-engineered in HTML5 and Javascript, resulting in the same problems of garish pop-ups and autoplaying videos in an implementation that is more difficult to block.