You're right. In the 1970s people estimated continued exponential per-person growth in the USA and ordered power plants in accordance. But then demand leveled off and lots of power plant orders were canceled. It's been nowhere near exponential in developed nations for some decades and is currently not expected to return to exponential growth. Sure, teleportation could be invented and use lots of energy, though, so if that's your point, fair enough. Let me rephrase my estimate a bit then to reemphasize the magnitude of the nuclear resource:
With 10 billion people using 40,000x the current per-person USA energy usage, we could power the world for at least 100,000 years with the nuclear resource.
With 10 billion people using 40,000x the current per-person USA energy usage, we could power the world for at least 100,000 years with the nuclear resource.