Just the other day I was complaining that Ogg Theora/Vorbis hasn’t really proven itself and achieved market penetration to the point where people will still care about it in several years. My concern with less popular file formats is that data is lost forever if future computing can’t view it. Popularity, while it may not be fair does help encourage it. For example I can still open up old WordPerfect files easier than I can Professional Write files (trip down memory lane anyone?)
I’m thrilled to see a push for open video. Better encoders and decoders along with working with the Wikimedia Foundation (Wikipedia’s use of Theora can be very influential) will hopefully provide a boost for these formats which tends to be a cyclical trend once it gains momentum.