This is CERN. They approved a study into building one.
They exist to study these things. Take away the toys and the institution has a hard time justifying itself. This is mostly self preservation.
In my opinion we should give the Lhc a 25 year leash and then give the whole super-high energy colliders thing a rest.
Put the funding into other research areas in physics; the reductionists have had their turn :)