Isn't blocking something unilaterally akin to a form of "censorship"?
I know the reasons for it and share them somewhat, but Flash is just as bad as badly coded Javascript when Browsers allow vulnerabilities AND server side code injection (CSRF, for example) as well. Browsers have vulnerabilities (hello IE, old FF), just like Flash has had them, but I never saw Microsoft nor Apple nor any Linux flavor group saying "yeah, we won't allow you to Install IE nor FF in your machines; they have issues with security".
I don't like nanny systems telling me what to do or not, so I really wouldn't like Google, Microsoft, Mozilla or Apple (yeah, I don't use Apple products) to do this.
Flash has to go, yes, but this is NOT the way of doing it.
Cheers!