Not sure where you live, but where I have traveled the interstates are worse than the back roads.I ride a 2009 KLR 650, I've been trolling the Versys group because I will probably get one next. As far as Enhinyero comment, the KLR and V650 are very different animals and to combine them would require a pretty hefty redesign. The KLR is way more street oriented for a dual-sport than say a Honda or Suzuki 650 dual-sport, but the KLR is tons more off-road worthy than the Versys. I don't think Kawasaki ever intended for the V650 or the KLR to compete directly. When I think of the Versys I think of a sport touring bike for real world, backroad touring. Backroads have potholes, cracks from roots and weather changes, damage from heavy vehicles etc.. Interstate touring doesn't need longer travel suspension and wide handlebars. The Versys with long legs can handle imperfections in the backroads. The KLR does a good job with it as well, and won't complain too much if you head off into the bush as long as your tire choice is appropriate.
Can I make a Versys an off-roader? Yes, but it is unlikely to ever match the KLR off-road. Can I make the KLR a sport tourer? Yes, but it will never match the Versys on road. I have put 90,000+ miles on my KLR, 90% on road. That is why I am looking at the Versys. I just got back from a NC mountains weekend with friends, and I easily out paced a Vstrom 650 in the twisties, but that's a rider level thing. I was also able to climb a steep gravel road to a mountain top the Vstrom couldn't climb. I have the picture to show for it. Could I have made it on a Versys? Maybe, I didn't have one to test it with. My point is Kawasaki would never had made either bike if one could directly replace the other. I have enjoyed my KLR, and a few times in the sand in Florida I'm glad it wasn't a Versys, but I think I would really appreciate the Versys more as my daily ride than the KLR just because it is built for exactly how I ride. 90% on road with off-road never really more than a gravel road. Just my opinion from my perspective. Enjoy your rides!
I owned both a KLR and Versys at the same time and there is a lot of overlap. So much so that I replaced the KLR with a KLX250S.