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Whilst living in London, I found that daily commuting could be just as hard wearing for wheel rims as off roading. You also don't have to clean all that horrible black shit off your rims after every wet ride when using discs.
Road bike frames, or forks at least, would have to be redesigned to cope with the stress from disc brakes, no?
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SRAM are currently researching hydraulics.
The reason I don't think disc brakes will end up on road bikes anytime soon is because they won't become race legal and manufacturers would neglect to work on something that can't be fitted to pro race bikes, which undoubtedly influence people's choice in bikes/componentry.
I could be completely wrong I don't work on the development team at Shimano -
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Yes and the front wheel may need to be dished like the rear. But as DJ pointed out, it's been done for cross bikes, so the 'formula' could be applied to road bikes and tweaked slightly