The LHC is but one of CERN’s world changing contributions.
As you said: this is the wrong place to get something like this wrong.
1. https://public-archive.web.cern.ch/en/About/History-en.html
[1] https://lhc-commissioning.web.cern.ch/schedule/LHC-long-term...
Keep in mind that the LHC would the existing tunnels from LEP, this new one will require a lot of drilling, so planning would have to start earlier relative to startup I imagine.
[1]: https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2014...
From a computing point of view, this poses lots of fun challenges!
The current plan I believe is to run LHC and the experiments until the end of the 30s, to maximize return on investment in terms of “data per CHF”.
Aside from that, CERN has other experiments and projects, some are benefitting from LHC and the big experiments, some are connected to the chain of preaccellerators, and some are completely independent.
If you mean, 'LHC has nothing more to do', where do you see that in the article?
The predecessor to LHC was called LEP: https://en.wikipedia.org/wiki/Large_Electron%E2%80%93Positro...
Yes, the LHC has done its job, more or less. Of course there is more utility to be squeezed out of it. But it is also time to consider the next generation.
https://home.web.cern.ch/science/accelerators/accelerator-co...