Are Hybrid discs useful?

[Stef Nighthawk]

I recently created a thread about triple layer hybrid HD-DVD discs which immediately got overshadowed by an anti-BD cloud brought by hmurchinson's talk about expensive BD pricing and the 'currently shipping' HD-DVD hybrids vs the 'non shipping' BD hybrids.

But in this thread let's not focus on the HD-DVD vs BD aspect but let's discuss the usefulness for a hybrid disc in general.

This is my point of view about how hybrids can be useful.

1. Hybrid discs should only exist if the content is never released on non-hybrid media. ie. non-hybrid discs are less expensive and conumers will only use it for one of the technologies on the disc. Eleminating choice would benefit the transition from SD to HD.

or
2. Hybrid discs should use the HD media to maximize the quality of the feature film and use the extra SD layer(s) to store many extras. These extras could be given a less strict DRM. This could even be used to eliminate those pesky double disc edition (or not if they really see it as a marketing trick)
So you could have a non hybrid standard edition like a one-disc DVD edition or a hybrid special edition with extra layer(s) of bonus content (as a new marketing trick) that can also be used for example in a computers DVD-Rom drive.

Do any of you see other uses for hybrid discs that could give meaning to their existense?

PS. how will hybrid discs be recognised in a computer's HD-DVD or BD drive? Are they going to be represented by one large volume or by two separate volumes/two folders?
PPS. What's the opinion of the studios about hybrid discs? On Both HD-DVD and BD they absolutely wanted a mechanism to protect their content against pirating. So why would they now have nothing against putting the same content on the disc and make it less secure?