Sounds like a good change. Which platforms are still using Flash and why? I had to download Flash to get several things to work. Updating it is a pain. It would be nice if it went away seamlessly.Even Adobe doesn't think people should use Flash any longer, so there likely won't be a huge amount of pushback on Chrome's changes. Flash is a menace on battery life and is continually found to have serious security flaws, so its eventual disappearance will be celebrated at every step.
I've been Flash free for about a year, I've hardly noticed any change in my browsing experience. Websites which are hold outs most likely haven't had an incentive to rewrite their sites to HTML5. Why do the work when most users have Flash installed? Hopefully this change to Chrome's policy will provide the incentive.
After reading your comment, I was just about to disable my Flash to see what would happen when that jogged my memory and reminded me of what demanded Flash. It was Hulu. Until I give up Hulu, it looks like I'll be keeping it. Hopefully, Chrome will make it harder for Hulu to continue using Flash when it gets too annoying for people.