Whether you’re working on the most important thing in computer science or the most important thing in computer science, you need GPUs.https://twitter.com/sama/status/968651640348622848 …
For GPUs supply will most likely meet demand, but in the case of smart people to work on innovative solutions in these areas (AI and Blockchain), supply is constant, so if you thought one was useless, it'd be better if it didn't exist.