Why should Nokia put tons of money into desktop Qt, they only really needed Qt for symbian and meego and now that they do not they are downsizing. There is no point in keeping Qt. With Digia they care about embedded and desktop as well as mobile so more work will go into Qt.
Now none of this would happen if Nokia didn't shoot themselves in the foot, I am not denying nokia has gone downhill and Elop is a total loser. That doesn't make Qt non free software.