The hard part of computerized custom shoes might be designing the shoes rather than measuring the foot. Also note that the shoe has to fit while you're walking, though that seems like just adding difficulty rather than a whole new problem.
I should have been more precise about the difference I see between flying cars and sous vide cooking. Flying cars include infrastructure and group effects in a way that sous vide cookers do not.
I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.