A nanotube is a man-made tube made of carbon atoms and it is stronger than diamond. But so far scientists are only able to make them 5 nanometers in diameter. But scientists hope to someday make big ones that can be very strong building materials.
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Eventually, yes. They will be used for everything, literally.
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Definately, because the strength to weight ratio is ridiculously high. This will make it possible for longer suspension bridges, lighter vehicles, lighter body armor, and possibly an elevator into space.
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This material is very expensive than the alternatives present on the market. So until there is no problem so important to spend an extra buck or a profit to be made I don’t see the usefulness of this material from an economic point of view.