And people are going to keep using it for some time because HTML5 doesn't do everything Flash does. Companies that need some sort of control over how their videos are watched have been able to use Adobe FMS to stream, livestream and encrypt bidirection audio and video. The HTML5 spec doesn't even solidify on a single codec (FFS), let alone specify how videos get there (past progressive download).
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So if Flash dies completely, and browsers don't improve things for people that require streaming and (shock horror) DRM, that just means people will move onto the next best thing: SilverLight. I don't think I need to spell out why that's worse for us.
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