do you have any idea how difficult it is to make cell cultures? it would require multiple nobel prize worthy discoveries to make it cost effective. first off cell cultures require a temperature controlled clean room environment. such a set up is not cheap to build or maintain. next you would need to find an alternative medium to grow the cells in as fetal bovine serum is not "sustainable" and good luck with that because nobody knows why fbs works as a medium in the first place. then there's the problem of waste build up. cell cultures don't have a circulatory system to get rid of waste so the waste just kind of builds up in the bioreactor and cells need to be harvested before this point. if you were to solve any of these issues you would win a nobel prize and become an over night billionaire because you would have greatly reduced the cost of biopharmaceuticals. i don't see this becoming affordable any time soon. probably not during our lifetimes.
United States