The whole debate about the digital disk wars is irrelevant. It really doesn't matter which format is more popular because it will become outdated in a few years anyway. Most people don't even watch movies from disks anymore, but they download or stream media from the Internet. It doesn't matter which format wins.
The HD DVD format should not have been accepted rather than the Blu-ray format. They both came out at the exact same time and more customers were more interested in purchasing the Blu-ray. This was just how it was with the marketing and they succeeded. I felt bad that the people that bought the HD DVD did not get their money back.
The difference between HD-DVD and Blueray are almost comically small and completely insignificant in the long term, and even Microsoft wanted to negotiate with Sony to create a universal format. Sony has lost the video cassette war in the 80s and were, this time around, trying to get the upperhand.
The Blu-Ray format is a higher quality disc with a larger storage space that will likely last for some time, perhaps even longer than the initial run of DVDs. The HD-DVD is already slightly outmoded in comparison, and if it would have won, something like a Blu-Ray alternative would have taken over the market anyway.
The HD DVD shouldn't have been accepted over the Blu-Ray format. Without a doubt, Blu-Ray was more widely used and offered more features and capabilities. HD DVDs weren't that great and were often a little more expensive than Blu-Ray discs. It's not surprising that Blu-Ray won the battle against HD DVD.