I like the way several features in the upcoming HTML5 standard are aimed at making the Flash plugin obsolete. It might make browsers more complicated, but if we no longer need to rely on Adobe to get their ubiquitous code running on new platforms, it will help a lot. On the down side, instead of having to worry only about any potential differences between Flash on Windows, Mac, Linux or mobile, now web developers may have to code around quirks that show up in, say, Opera on Mac or Firefox on Linux.
Mokalus of Borg
PS - It won't be made completely obsolete, I'll bet.
PPS - There are only so many use cases that a standard can encompass.