Hi Bikermutt,
For what it is worth I would encourage your son to get interested and adept at 3d drawing. No matter how many robots there are taking over jobs you still have to have people create art and that is to be able to conceptualize something and find the best ways to create it. The bloke who has heaps of robots will still prefer to pay for some artists works than any robots work. Your carpentry and your wife's art skills will assist him greatly in time and with arthritis coming on perhaps your self as well.I use 3d a lot these days, to make moulds for casting leather with the 3d printer and jewellery designs to receive inlaid crocodile pieces and supports for zippered purses and so on. Think about printing the outer part mold with all of the pattern on and pressing it all in one go. I know a lot here would be horrified at the thought but when a basket weave punch was first made was it then considered that it would not be right to do the whole stamping in one go in the future? The future can be bright and I believe the concept as a whole and quality and affordability of the end product is what is most important. As for marketing I do very little as I find that mostly they find you if your worth finding.
Most people don't know me and that is my preference but I can proudly say that I contract manufacture crocodile leather goods for some of the biggest brand names in the world and have done so for years. I wish you and your family better luck in your future. If you are interested to see any pictures let me know.
Regards Brian F