Jari,
I agree strongly with just about everything you've said, and that's the approach I prefer to take going forward.
As for your last point regarding whether the license is exclusive or non-exclusive -- I think that what is necessary here is further analysis of the nature and type of use that each community (and others) make of the term IANA. Not every use of a trademark requires a license (I don't need a license from Nike to wear their athletic gear) but a fact-specific analysis needs to be done to determine whether and what kind of license is needed. In the end, the goal is to allow PTI and each of the other communities the appropriate latitude to use the mark and domains while still staying within the bounds of trademark law and protecting the strength and value of the mark. I look forward to helping with that analysis.
Greg