Nothing would change for KDE, which is LGPL and builds on an LGPL toolkit, which would additionally become BSD-licensed.
That deal elegantly removes the danger of Qt being closed. You know that, that's why you are getting so agitated every time somebody mentions is. Qt is Free, as in FSF free, and the community is happy to have such a tool at their disposal.
You are a loud fanboy and a disgrace to the GNOME community, which has been actively cooperating with the KDE community and working on common standards for years now. Nobody needs your holy war.