That would help up to a point, but there also ongoing research to manufacture it using recombinant techniques - that is, genetically engineering bacteria to pro

That would help up to a point, but there also ongoing research to manufacture it using recombinant techniques - that is, genetically engineering bacteria to produce the required protein product and then purifying it out. Then your limiting factor is a reproducible manufacturing process rather than availability of human sources. This is akin to how, for example, insulin and human growth hormone are now produced; previously they also lacked scalability due to having to be sourced from cadavers. So yes right now it's not scalable, but in the future this limitation will hopefully be corrected.