That's still just cuprate superconductors except flattened inside of a metal tube. It's still expensive, inflexible, and for reasons to do with the SC physics,

That's still just cuprate superconductors except flattened inside of a metal tube. It's still expensive, inflexible, and for reasons to do with the SC physics, behave differently than the kind of Type 1 superconductors needed for MRIs and NMRs (high temperature superconductors are Type 2 and are a drastically different phenomenon).