Historically Microsoft has had little to no success in influencing standards others are interested in (nobody trusts them). They'll probably have no success on this unless they are willing to spend substantial cash subsidizing one or the other format in the PC market. The drivers Microsoft includes in Windows are typically written by outside vendors (even the ones that say “Microsoftâ€) and all the hardware manufacturers will have their own drivers – this is likely a wash.
There's little point in either format for porn unless you're willing to release in a high definition format, and that's a ways off for cost reasons. Some companies proudly say “Shot on Hi-Def†but that's not at all the same as releasing the footage high-def. The costs are likely very high, involving everything from the cost of the camera, extra makeup time, better lighting (HD cameras need more light), better sets, editing station costs , all the way to replication costs. I see no chance of porn studios being able to recover the cost of building out an HD infrastructure through higher prices.
(is there any realistic estimate of the number of units porn sells to consumers as opposed to sold for rental?)
I haven't followed this one closely. I think HD-DVD has a lead of six months to a year getting to market, meaning it has a lead to becoming economically viable for consumers as production ramps up and costs come down. But that doesn't mean there will be content due the Hollywood's traditional reluctance to face the future.
It's possible the issue will be decided in the PC market if Hollywood doesn't release content. If Microsoft is willing to subsidize one format enough to get Dell to place big orders then that might drive the cost of that format low enough to decide the issue in the consumer market too – consumers won't spend hundreds of dollars more for Hollywood's format, if Hollywood is releasing stuff in dribbles.
If Hollywood wants to back on format or the other successfully they'll need to subsidize a broad range content releases early to give consumers a reason to pick one over the other. And I don't mean Porky's 7 either: they need to beat up Spielberg and Lucas (Cameron has been consumer-friendly in the past and won't be a problem here, but I don't think he owns his content).
I think Microsoft and others in the PC industry prefer Blu-ray for higher capacity.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock