Earlier quoted context omitted.
> Today we have detectors and computing power that let us observe the natural experiment of the universe with a precision and diligence that would be impossible when LHC was commissioned. Couldn't the LHC be upgraded then to take advantage of this? Sounds like a much cheaper option. But I'm not a physicist at all so I'm sure I'm oversimplifying.
The detectors on the LHC get upgraded regularly, between every run some part gets updated. Computing-wise as well, better computing resources are there. The fundamental limitations isn't the detectors or computers, it's the energies you can reach with a collider of that size. Yes you can completely retool the LHC, which will probably allow you to do slightly better precision measurements, but won't strongly affect th…
Superconducting magnets enable much higher energies in smaller (granted, theoretical) fusion reactor designs than previously possible. Does the same not apply to colliders?