One solution could be to side step the issue by getting really good at flexible just in time manufacturing. This lets you decouple the company from products. When someone needs a fridge, a fridge is made. The companies running the factories could be big build to order companies that could make a huge variety of things and the plans could be for sale by “fabless” appliance companies or open source.
This is sort of how chip and electronic parts manufacture works.
In this model making something with a really long life span is fine. You might run low on fridge orders, but that just means your factories are free to make e-bikes or server racks or heat pumps or whatever the thing with demand happens to be.