There are other disruptive technologies that could be worth trillions.

* Self driving cars and robotic taxis could be $2 trillion opportunity by 2030

* According to ARK, 3D printing may grow into a $41 billion market by 2020, and Wood noted a McKinsey forecast of as much as $490 billion by 2025.

* ARK thinks mobile transactions could grow 15x, from $1 trillion today to upwards of $15 trillion by 2020.

* By 2035, Wood said US GDP could be $12 trillion more than it would have been without robotics and automation—that's a $40 trillion economy instead of a $28 trillion economy.