We don't know any of that, jvd.
We certainly don't know any of that, and we certainly don't know the long-term outlook. But companies certainly look at a broad sweep of costs and savings for umpteen numbers of years, and make their decisions based on that. At the moment, HD-DVD and BR have been showing things off in "pilot lines" and "expectations" and "aiming for"s and "in the long run"s... Despite demands for "proof" as to any of this, all
we can really go by are press releases. (Which seem to be putting them all relatively close to each otherk optimally.)
What the realities are, how the costs will break down in the next year or two, what projects are for Year 5 and Year 10... That's what the publishers will be looking at and figuing in. And they'll certainly be looking at more than press releases.
Manufacturing costs will have little bearing to what it costs US anyway, as they'll be pricing it for the consumer at what they think the market will bear. ...and it will undoubtedly still be bringing in a tidy profit for them.
They'll just factor in how the profits will change from one option to another.
In the meanwhile--who cares? We won't know the full picture (hell, we don't really know all that much about relative DVD costs, either), and the companies aren't really concerned with the short term. (After all, what were the adoption costs of DVD itself? Yada yada...)
Mainly it will depend how well they can judge what is currently in play, and make their own determinations as to how well that would match projections.