Full GPL release of the engine would still be great though. They don't really have anything to lose making the code public, since most AAA companies use their own tech and indies opt for engines that offer ease of use, good documentation and not overly restrictive licensing (see UE4 and Unity).
Pushing BFG forward is a neat idea, we lack coders to do so though. I'll definitely use BFG/SE2 branch for a small project and I'm also really into TDM engine. Somehow, I'm more comfortable working with Tech4 based engines than even UE4. I just love the freedom it gives in all aspects of editing.