New food experiences for the win
That is where creative cooks will make some magic with these tools. But the tools by themselves won't lead to food that makes any kind of sense. It reminds me me of Alton Brown using an centrifuge in one of the episodes. There was a guest chef he was "competing" against in the episode, which was really a showcase on using some non traditional tools and methods in the kitchen. But you could see the light bulb come on for the chef as clearly as you could see he was not impressed with Alton's version of tomato soup.
It will never make sense to stock a "3D food printer" to cook user selectable food choices in real time. It's too slow, too expensive, and in the end pointless. You can stack pre-made versions of the limited selections you could print in the same space such a machine would take up, but cheaper, faster, and more efficiently. Japan already is.
So you are left with the novel factor, which for a vending machine is self limiting. Or you let the chefs go cracy with them, 3d printing a crispy shell and possibly filling it with tasty things. Plenty already are with things like chocolate. But in reality, it's mostly just a minor tool that can easily make a handful of shapes that are hard to do with a mold or form.
So I expect I will see this on cooking shows more than in working kitchens.