Cartridges and old man

As far as I know some of the best cartridges are being build by old or ageing men. Carts like van en Hul, Lyra, Koetsu, Jan Allearts, and maybe some others are all being build by older men.

What will happen when those people die out? Will there be a next generation of people who will take over a new generation of pioneers?

What do you think?