Mind that the original paper is 20 years old. Of course we could construct a more powerful intermediate collider today than the sub-TEV one suggested in this ol

Mind that the original paper is 20 years old. Of course we could construct a more powerful intermediate collider today than the sub-TEV one suggested in this old paper. I think most proposals these days target ~10 TeV to study the Higgs and probe the rest of the weak scale for supersymmetry. But these are just the fancy high-end goals. There's a plethora of other things we could learn simply from building such a machine, because it requires so many new technologies.