The barrier is the length of time it takes to show the device operates as you predict. There's this profound enhancement and modelling capability, a huge database that was not available in the previous century, and these side tests that you can do. The barrier, basically, is to find the sponsor and be up and running, and to build this thing efficiently.
We're thinking that in the end it will take state money, not just the money of visionary investors, to build this device. The 2022 schedule assumes that some state does indeed step in to support it.