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Carrying a different belt is only necessary for large gear changes, for which you'd have to carry a (heavier) spare chain if using chain drive, so I don't imagine that's the issue.

very good point! i meant just links for changing length of chain - but monday morning silliness has stopped me from thinking - probably not an issue

just not sure how much belt drive will catch on in the offroad world - great for off the shelf city bikes which require low maintenance - fit and forget but i don't see any real advantage for any other kind of bike, is it lighter or heavier once you put on the funny chainring guards? and what about chainline? belt drives look pretty thick, there are enough chainline issues with normal setups but what about when you've got a guard on each side?