Even if it was a cheap mass-producable metastable room temperature superconductor the stored energy in hydrogen compressed to such a density would mean it would be a very good explosive - not something you would want to use for energy transfer with wires. Maybe as a thin nm level coating for superconducting computers or something.
Likely though this will never be anything else other than a scientific curiosity. Diamond anvil cells are not something you can automate, but a complete pain in the ass to set up, align, and use. There is a reason that this took so long to accomplish despite DACs being around for decades. I very much doubt that it would be metastable at room temperature - I can't find any good publication that convinces me otherwise.
Only counter argument would be if it *was* metastable typically anything that can be made at high pressure can be made using other shortcuts - CVD, hydrothermal synthesis, chemically with catalysts, other plasma discharges, etc. If it turned out to be metastable you could bet someone would find another way of synthesizing it.