[WorldMaker]

Plus most of the users using Flash and Silverlight for things like watching movies aren't likely to recognize that they are plugins. The answer to "How do you watch movies online?" is probably "Hulu" or "Netflix". Flash and Silverlight were never brands that non-technical users paid much attention to, they were means to an end. If they install something to "watch movies on Netflix", they may not remember because it was a one-time ask by the site they visit, and whatever it asked them to install didn't matter to the user so long as they could "watch movies on Netflix".