Hard drives are discs too. But whatever the details, the point was that optical discs as a consumer format aren't likely to continue to dominate as either delivery format or storage. I'm not too up to date on the current details of PCD but Holographic discs have looked pretty cool in the lab. Neither of which are close to consumer release, and though the technology is cool, they have drawbacks that will keep them in the lab and off the store shelves. In the meantime hard drive capacities will rise while costs drop and the internet will only get faster and more widespread.
We're six months down the road from when this thread started and I still don't see Blu Ray gaining the kind of ground that would establish it as anything more than a niche format.
Don't get me wrong, I've been making my living off of optical discs for the last decade, and I really do like the quality of Blu Ray but if I weren't working in the business I wouldn't even have a BD player.