I wouldn't need XBMC to run on the new xbox. It'd be convenient yes but not a necessity. I just used Windows Media Player to access my XBMC library and the majority of information showed up. Genre, Title, IMDB rating, etc.
Would being able to use the XBMC interface, and all of the nice plugins help? DEFINITELY. But if you could access all of your media, through Xbox One's interface, with the majority of the data that XBMC has, that wouldn't be bad either. I doubt it'll pull everything, but it'd still be great.
I think though that getting an XBMC addon to Xbox One wouldn't be that hard if we petitioned Microsoft. It'd be a more locked down version (no addons), but being able to access your whole media through your favorite skin would be a +. I really don't see why Live TV wouldn't work through the addon as well.
Like eg4190 says though, I think it'd be possible to make an XBMC that'd work. It's just would you want to put that effort in for that console?
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msarro no one knows the used game thing yet. It's a rumor. The rumors being spread about the new xbox are way out of hand.
I wasn't trying to say Xbox One would run XBMC though when I started this, just whether people though HTPC type tools/media would become more popular as XB1 is primarily a media device now for the living room and no longer just a gaming console. The whole presentation was Media media media, and barely referenced games, although they are there and will be presented at E3.