To be honest MB probably didn't anticipate many X Class owners having an interest in taking their vehicle off road. If that's something that they were going to offer it probably would have been restricted to the v6.
Beauty of it is, if demand suggest some owners want a workhorse, Mercedes can release a spec tailored to those needs to test the market. Already they have products like the Metris and Sprinter that are workhorses. So the idea isn't far off from happening.With the demand for this kind of feature being quite low, its something that you'll have to go down segment for. The X Class was never designed to be a workhorse, and I bet there will be very few of them that will ever leave the pavement.