GPL defines itself by four essential freedoms. Your argument is, why some piece of software should (or should not) be relicensed to GPL. My argument is, that

GPL defines itself by four essential freedoms. Your argument is, why some piece of software should (or should not) be relicensed to GPL. My argument is, that since that piece of software is currently not GPL licensed; avoids the relicensing topics and explores how to solve the current situation wrt distribution of the combined work. Use by the end-user is non-issue, due to freedom 0.