With my above statement being made let me add that I do like the ideas of these kinds of vehicles.
For instance a while ago Jeep was thinking about coming out with a Wrangler pickup type vehicle. It wasn't good for towing, I think 2,000 lbs or so, however it had a 5 foot bed. A large portion of people who buy pickups buy them because of the bed, not necessarily the towing capacity.
I definitely think that a new class of SUV/Truck needs to be made and it would do quite well IMO. Think of it as a more rugged crossover, a good on road vehicle with 20+ MPGs. However whenever you need it to crawl through some mud, go up steep uneven terrain, or you need to carry 1,000 lbs of materials it can do so as well.