Yes they will still be not so great because of lower base damage but at least they'll have a chance to not totally suck and possibly AH-worthy. Even a 800-900 DPS weapon can sell for OK or even high amounts of gold if it rolls great stats on it.
IMO Inferno Diablo should always be MP10. They should be able to present the last boss on the highest difficulty level (inferno) as the ultimate challenge. Not provide an out for weaker players that aren't even trying to do it in any other way than the easiest.