HD-DVD Drive ONLY For Movies

Due to speculation on the 360's HD-DVD drive, on Microsoft's Gamerscoreblog employee John Porcaro has decided to reinstate the software giants intentions with its upcoming HD-DVD drive for the Xbox360. In the blog he says

"I'm seeing lots of speculation about our upcoming HD DVD Player, and whether we have plans to publish HD DVD games. The answer is no.

Since announcing the Xbox 360 HD DVD Player accessory at E3 2006, we’ve been clear that it is designed exclusively for playing HD DVD movies. It will not play games on HD DVD.

At this point, we haven’t seen anything to suggest that next-gen DVD formats offer a better game experience than current DVD. What we do know is that these formats will bring added cost to game developers, disc manufacturing, and could even result in added costs and longer load times for the consumer, which would negatively impact the game experience. We are focused on making great HD games available to consumers now, and games like “The Elder Scrolls IV: Oblivion” clearly show that beautiful high def graphics and huge, immersive worlds to explore are possible on the DVD9 format."

Well, i guess that clears up that then...but, although there have been no developers asking for more room as of yet, later on in the 360's life, will they be?
Because towards the end of the original Xbox's life cycle, developers were using up much more space on the discs as they were able to push the machine harder, although no multiple disc games came out (were there??), developers were getting mightily close to the limit. I just wonder whether or not due to the HD content with this generation of games, will they eventually be needing more room, or will they have to go down the, very unelegant, multiple disc route?