It is getting easier to get by entirely without flash.
But just an FYI to some people who don't get it (pejakm).... videos are NOT the part of flash you can't get by without. There are a lot of websites that use flash for navigation or other essential features. Videos can easily be done without -- no big deal.
Also pejakm: I've never seen a flash crash take down X. Firefox for sure, but that's as far as it makes it. If given multiple cores though, it could potentially peg them all and make it a miserable operation to kill it.