Many apps are great when you assume that they will be universally used.
I guess I fall in your second category: "not feasible, too large in scope". But you know that someone, someday, will come up with something that will kind of remind you of this idea.
I guess I fall in your second category: "not feasible, too large in scope". But you know that someone, someday, will come up with something that will kind of remind you of this idea.