I'm unable to change the wording of the petition after people
have signed it (for the obvious reason of not changing what
people have agreed with).
But personally I wouldn't have an issue with CDE
being released under any of the licenses you mention.
But I understand your concerns with regard to a GPLd
Motif, you wouldn't want previously closed source apps
written against motif being forced to open, or not be
available on platforms where an open source Motif
was installed. But I don't have issues with a BSD or
MIT license. As long as the license terms are known
up front people will always have an informed choice
to make when contributing too, or using code from
an open source project.
With regard to Open Group's more recent choices of
Open licenses. DCE, a suite of programs for distributed
computer was released under the GNU LGPL.
So, in summary, it seems that The Open Group
have a much finer grasp of license mechanics than
when the OpenMotif code was released.