Every few years (months?) there seems to be a newcomer on the block who incites cries of the next “Flash killer.” First there was Silverlight, then JavaFx, then Unity3D (at least until Flash 11 ; ) — and now it’s HTML 5 which is inspiring people to take pot shots at Flash.
All I have to say is: I DON’T THINK SO.
Oh, so you’re looking for a better reason? Have fun waiting then! :)