If Qt isn't the problem, then help fix OpenMW's use of Qt.
DirectX isn't an option, it isn't cross-platform so that argument dead on arrival.Many developers also come here knowing DirectX and are not eager to delve into another graphics abstraction layer. So they leave again. Do you think your average Windows DX developer is going to start using OSG ? Learning + getting it to compile is it a time commitment which appears to be completely unnecessary when you already know something perfectly working, like DirectX. It's only interesting for Linux developers. I outright dare to proclaim; If OpenMW would use DirectX exclusively we would have OpenSkyrim already. I suspect this forum underestimated the number of game engine developers familiar only with DirectX.
That being said, why does OSG have to do with helping to work on OpenMW?
There is more than enough work to go into OpenMW that doesn't have anything to do with OSG. So your bold claim is baseless. To further the point, when OpenMW did use DirectX, why didn't all the DirectX developers come flocking? Where is OpenOblivion and OpenSkyrim? You're just being disingenuous. Scrawl bent over backwards to make sure that OpenMW worked on OpenGL and DirectX renderers for years. Since he was the only one doing any work on the graphics side, he proposed that we switch to OSG then suddenly we have more Windows developers wanting to work on the graphics side of things. Why is that?