Also, it could be wherever nuclear wouldn’t be permissible otherwise (e.g floating in the middle of the Pacific Ocean extracting CO2 from the atmosphere, away from populations that don’t want it nearby)

Yup, said another way, this would only really make sense if we are producing more energy than we can reasonably use and need to sink it somewhere.

However, there are so many sinks for energy that I just doubt CO2 will be a priority any time soon. Desalination, for example, will almost certainly end up being a huge energy sink as the world gets hotter.

I have to wonder if at some point rich eccentrics will start installing CO2 scrubbers in their houses to bring the indoor concentration below 400 ppm.

[delayed]

Plants will be popular