I didn't think it was possible, but Curse of The Puppet Master, Retro Puppet Master, and Puppet Master Legacy are being planned for Blu-ray!:
At the time, I though it was just a rumor, until I found this on DeCoteau's Facebook page:
"Wow! Just heard we found 6.5 hours of behind the scenes footage from RETRO-PUPPETMASTER. This BluRay is gonna be awesome."
So I guess they found a way to restore the films shot on film and edited on video.