[EvgeniyZh]

It's not that simple. There are many smaller scale experiments in HEP, all kind of dark matter detectors among them. Colliders are irreplaceable in a sense that we do not know how to get higher energies without them, but it's unclear for me that just getting higher energies is enough.

Energy scales for new physics can be enormous for all we know, I do not see any reason to expect that new physics hides "around the corner" (in a 1.5 orders of magnitude FCC or muon collider could give us). Muon collider is at least looking in a different place, and it's definitely more interesting than FCC for me, but I'm still not 100% sure it is the right thing to do, given the limited resources.