The world of next generation high energy physics machines is highly political. There are plans for LHC luminosity and energy upgrades. The long delayed ILC (international linear collider) project, proposed for Japan. Competing designs for a lower energy circular lepton collider (maybe China) to be upgraded to a very high energy hadron collider. Laser and beam driven plasma accelerators - neither anywhere near practical yet. CLIC, Muon collider, VLHC, etc.
There really are two issues: Is it worth ~10B$ to build the next generation high energy physics machine, and if it is, which of the many machines should be built. With machine development likely to take a generation, people on any project know that success of another will doom their machine.
Neither question is easy to answer. There is no clear way to measure the value of fundamental physics measurements. The likely technological value is zero, though spin-offs can be valuable.
To me personally, learning about the most basic structure of the universe from high energy physics, or astrophysics is valuable, even if it has no imaginable application. I view learning about the universe as one of the goals of civilization, not a means.