With the popularity of half-ton trucks as daily drivers along with the prevalence of independent, sport-tuned rear suspensions, I don't forsee towing being a priority in cars. I can see it for SUVs, even maybe for crossovers, but since most buyers of cars never put a hitch on the car I don't think that it's a high priority for the manufacturers. If they do choose to augment towing then I expect commercial-capable platforms like minivans to get attention first.