>I agree, it reads like a variation of 'there's nothing left to discover so lets all go home and not bother'
I don't think that's quite right. The big problem isn't that there is 'nothing left to discover' because we know there are interesting physics at higher energy scales. What we don't actually know if there is anything interesting at the energy scales that this particle accelerator could achieve. You could literally spend two decades building this, and in the end, all you would do is rule out a tiny energy-scale slice.
I don't think that's quite right. The big problem isn't that there is 'nothing left to discover' because we know there are interesting physics at higher energy scales. What we don't actually know if there is anything interesting at the energy scales that this particle accelerator could achieve. You could literally spend two decades building this, and in the end, all you would do is rule out a tiny energy-scale slice.