You are quite right. The software libraries for HD-DVD and Blu-ray are turning out to be a bit stronger than those that developed for DVD-Audio and SACD, but otherwise the similarities are striking - which is why some people continue to worry about the future of HD optical discs. The HD format war is not likely to play out exactly the same way that the high-res audio disc format war did, but it is still not a situation that is healthy for HD optical discs in the long term.