The video makes it pretty clear, magnetic field strength is directly related to the overall dimensions of the reactor. If you upgrade the magnets, then the physical dimensions would need to change as well, which at this point would be very difficult seeing as how they're already pouring concrete...
That was not my takeaway - I understood that it merely allows you to achieve higher magnetic field and plasma density in the same volume. It does not force you to use a smaller volume. Am I getting it wrong?
