And that's based on what? The number of lightsources in the world? There's dozens of research groups studying quantum computing. I guess they should just pack up and move on to less developed fields.
In reality, there are huge open problems with synchrotron light sources that people are spending their careers on (and I don't think they're jealous of HEP). What I'm more interested in, however, are university scale sources of xrays and matter for atomic scale physics. Even though there are a few dozen facilities around the world, all of them are oversubscribed. Many times if you apply for time on a synchrotron you'll be denied because there just isn't space for you. Even companies that pay for time (and yes these machines don't just impact local job counts) don't always get a slot. It would be transformative to take some of these techniques (and more advanced ones) to a wider audience.
