According to this opinion they should.
Things Don’t ”Ad” Up
“I recommended an amicable solution to the KDE/Qt problem: I did not suggest KDE do anything to illegally or immorally harm Trolltech, but rather suggested maybe the two should part ways. You can agree or disagree with whether that is a good idea, but either way, I am not advocating anything immoral. Finding alternatives is exactly the thing I also advise here.”
ermm… just exactly how Kde is to part with Qt is not discussed. 🙂