I agree that there is a chance that this could be the LAST playset ever put out by Hasbro. While I deep down had hoped that they would simply re-release the old Death Star and Ewok Village playsets, that hasn't happened.
Like with the Arena playset, I will be getting this just because I am a completist. With the Arena however, I didn't get a second one until it went on clearance. I might wait for the same thing to happen here for my opener one. I do want to get it simply because of the importance the planet Mustafar plays in the birth of Darth Vader as he is in the OT.
I guess in my mind, I was hoping for something more like the Theed Generator Complex playset from TPM - only a bit bigger - in other words, little areas where you could plug Anakin and Obi-Wan in and recreate sections of the Duel. I never imagined that they would actually try a "lava" feature - any attempt at a lava feature is a "damned if they do, damned if they don't" scenario:
1) If the lava is just painted and doesn't do anything, that might be viewed as lame
2) If the lava is like an "ooze" then parents will be hesitant simply for the "I don't want that crap getting into my rugs or furniture" factor
3) If it doesn't look good, collectors who only buy stuff based on looks will just pass