Might be worth taking one off and weighing it to see what the potential gain might be. I replaced some generic Ibanez tuners with US Ultralites and it only saved about 15g a tuner, but those ones pictured look like they might be lighter?
Hard to see them disappearing, you'd imagine they'll get acquired by one of the bigger conglomerates. Kontakt seems like such an industry standard that someone will want the IP at least.
Have you tried asking the place you bought from? If you bought from a shop (ie not a private sale) then they should be the ones supplying you with any missing parts/replacing the whole thing, surely?