Excellent points, and I agree wholeheartedly. However, I take issue with some of your information concerning HD DVD:
HD DVD's HDi isn't really all that programmable. It was designed more for ease of use than flexibility. It's basically a toolset designed by MS to allow studios to use certain feature with some creativity for interactivity on HD DVDs. BD-Java, however, is... well, it's java. It's a programming language, and studios can use to create whatever the hell they want on a Blu-Ray disc.
Look at it this way, HDi is like a map editor in any RTS game. You can do some pretty cool stuff with it, and it's real easy to use, but everything is predefined, and you are ultimately limited by what is available in the editor. BD-J, in comparison, is a complete language. Instead of having the editor already right there in front of you, you use the language to create your own game/editor. Sure, at first things will take much longer to do than with HDi, as you have to create everything from scratch, but you can choose to go in any direction you want, make any editor you want, and once your editor has been created, you can reuse that editor for every release after that, and continue to change it as you see fit. At first BD-J is much harder to work with, but the possibilities are much more open than HDi.
Also, Amir, the MS insider from AVS/HDD, said that the TL51 discs were created merely to say, "we can do that, if we need to," and will most likely never be used. Check out these statements from a thread on HDD (post 1, post 2):
TL-51 is an advancement for HD DVD to show that the format scales. But the premise of HD DVD does not depend on it. It never has. DL-34 may get productized though and the yields for that won't be different than HD DVD-30. HD DVD has done what it needed to do to prove its case: dual layer with combo produced, the market and readily manufacturable. That's it.
