Is it really all WNW to blame here? For example, with the DrI, so many modelers refuse to dirty their hands buying and building the Roden kit and just endlessly call for WNW to do it even when the Roden kit is just fine. Pretty hard to blame WNW for that IMHO? I do think they will eventually do it - they did the Camel after all, but it may be a long time coming....
As has been stated innumerable times, here and elsewhere, yes, the Roden/Encore Dr.I kit is OK, but when it comes to the Dr.I, many don't want just OK, they want fabulous, which the Roden kit is not, but a WNW kit most certainly would be. To not want to compete with an existing product, is, in my opinion, a concept that makes no sense whatsoever.
Case in point; the Revell Mustang vs the Tamiya Mustang. While many will clamor for the excellent Tamiya kit, many more have also proved that they are perfectly willing to snatch the new Revell kit in rather large numbers, despite the existence of the Tamiya kit. Why? The price, Revell being reasonably cheap, whereas the Tamiya kit is not. The consequence? The two kits in no way are in direct completion with each other, as they generally appeal to two distinctly different market groups.
I fully expect, as I have anticipated all along, that WNW will eventually do a Dr.I. When that may be, I have no earthly idea, but I fervently believe they will eventually release one.