Yes, I remember the commercial BSD license, but it's been gone for quite a while now, and it doesn't seem to have changed much. Of the two companies that did at least make an attempt to give back, both wrote their own licenses rather than use the BSD license for their modifications.

And of course the argument is different for X, that's been under a BSD-like license for much longer.

I wouldn't suggest the GPL as a means of "poisoning the BSD water-hole" - that's pejorative. I would suggest the GPL as a means of providing a path for people who prefer to have a license protecting the free-ness of their efforts.

Thanks

Bruce