Jörn has been running prototype gear for most of the time, working closely together with Gerd Strenge. As long as the paycheck is good I don't see Jörn leaving, and if he does, I wouldn't be surprised if Gerd Strenge would, too.
As for a 4WD-style 2WD production car, who knows. I do know that Jörn will usually run whatever works best, which is usually a prototype: after all you gain knowledge from running your car which uncovers room for improvement, and a competitive spirit will not wait around to implement these improvements
However, Durango will not produce a 4WD-2WD just because the pro runs it, there has to be sufficient demand for it. From what I have seen running where I go, the 410V4 and 210V2 haven't been selling as well as their respective predecessors. If that is the case, I'm not sure they'll make a release that may compete as much with their own sales from other cars as it does with that of other brands.