I haven't read the article but when I left the field 5 years ago it seemed like we were not going to find anything. By then most of the parameter space for SUSY

I haven't read the article but when I left the field 5 years ago it seemed like we were not going to find anything. By then most of the parameter space for SUSY had been excluded, dark matter didn't look promising, my area of expertise, strong gravity signatures was strongly excluded. So the margin for discovery and career advancement in the field was not great. Moreover if you didn't find anything around ~10 TeV you could make convincing theoretical arguments based on the Hierarchy problem you wouldn't find anything at 100 TeV or even 1000 TeV, the next energy regime where you might think you could find things would be something like 10^9 TeV where microscopic gravitational effects would become visible. Of course you are already near the limits of human engineering building a ~10-100 TeV collider. The only way you can probe higher energy would be in astrophysical processes or maybe cosmic rays. The other option is instead of going for higher center of mass energy you go for rates and try to channel high luminosity beams and do ultra precise measurements of physical parameters and try to deduce significant deviations from theory. That's the idea behind the ILC, electron beams are clean and with a linear collider you don't have synchrotron radiation background to worry about. Another way is the any number of fixed target neutrino experiments. Basically you setup an extremely sensitive detector somewhere with low background, like the bottom of a nickel mine and you wait to detect a once in a blue moon neutrino that interacts with the nucleus of an atom. But they too haven't found significant deviations from expectation to the best of my knowledge in recent years. All in all, I think high energy physics is in kind of a funk. Don't get me wrong, the technology of the modern world, including much of the big data techniques, what is used in the Big N tech companies was pioneered in particle physics but as a scientific field we are in kind of a funk. The LHC was supposed to guide the direction of theoretical research by excluding some and supporting other ideas but in the absence of any new discoveries the field is kind of without a clear direction. You have to have a strong theoretical argument for why you want to build a bigger collider.