Not going to happen, it's well and truly over.
I doubt Toshiba or Sanyo would start re-production based on this industries piddley numbers.
In fact I would have back-ups for the rarer parts, just in case, and insure your BHSE is able to continue past component life span or sudden failure.
Yes, imagine having to build the equipment and pay a technician to make tubes for just a few people. Are there even that many technicians left making tubes?