Ken Nadvornick
Member
Both Do able and Desirable are to be considered.
But that admonition applies to all things in life. Not just commercial products. Or 126 plastic film cartridges.
If there is to be a future market for 126 film, then there will also be technology to make the required cartridges. Manufacturing new injection molded cartridges will be the least of the associated worries involved, because that industrial capability already exists in highly refined form.
That's how market-driven economies work. Product designers and manufacturing companies fill new market voids. SpaceX isn't building rockets and spacecraft for the fun of it.* They are building them because there is finally a market for them.
Ken
* Although I can't even imagine how much fun it must be for those few skilled in the art...