Not disappearing in a flash
Flash does not mainly contribute annoyances: poorly concieved or executed content does that, just like badly written code or awful .midi files. The major community video sites typically use Flash player to display video with no complaints.
Also, Flash has had accessibility / screen reader support since Flash MX (Player 6), I should know, I've built fully accessible flash applications that work like a charm in JAWS (tho they were a bit of a pain to develop!).