Earlier quoted context omitted.
The big advantage of Flash is that you write once and it runs everywhere. Anything that leaves it up to browsers to implement will not be able to boast that any time soon.
Flash doesn't run on iPhone and it is often slow and buggy on anything but Windows. I bet that Apple, Google and browser developers will support standards-based alternatives. We can see this happening in the original post.
Flash works fine on OSX in my experience. A good portion of our startup depends on it, and my cofounders code on Macbooks.