Probably 90-95% of all Honda CRV, ToyotaRAV4, Ford Escapes are all sold with front wheel drive not 4 wheel drive. Just because something is called X doesn't mean it will sell. I actually think the opposite, why doesn't BMW offer the X5 and X3 in rear wheel drive and save the weight and gas mileage. Think about the Grand Cherokee, Toyota4runner and Nissan's that are rear wheel drive. Around here you can't find a 4 Runner with all wheel drive. Even the X3's main competitor the Lexus is sold probably 90% of the time with front wheel drive so what's the hang up? I would not be surprised to see an X3 with S drive in the future.
1995 325i,1996 328ci,1997 528i,1997 Z3 2.8,
2001 X5 3.0,2001 330i Conv,2002 M3 Conv,
2003 M3 Coupe,2004 M3 Coupe,2004 Z4 3.0,
2004 X3 3.0,2007 X3 3.0,2007 335i Conv.,
2013 X1 28 sdrive M Sport, 2014 M235 on order