1. Superconductors that retain their properties above -190C but not much higher. It is more probable scenario and would be a huge win on its own.
2. Superconductors at -23C. This ones obviously doesn't need liquid gasses to operate, and so would be even more revolutionary (more compact, cheaper and efficient). But it is unlikely (to me) that we can see such a techlogical leap in one go, without first finding something that works between -23 and -190.
But we already have liquid nitrogen superconductors and they aren't used in MRI machines. I think the reason is something-something current density something - that they aren't suitable for that particular use for some other reason.
And MRI which can be cooled with a conventional electric freezer would cost order of magnitude less, probably. Which mean it could be deployed even in the rural regions and underdeveloped countries, like some x-ray machine today (it is more complex tool of course, this was a metaphor).
So that's the gist of it, reducing the infrastructure costs significantly. And the interesting thing about diagnostic healthcare is that their potential market is a perfect circle of all humans on the planet. The maximum possible market, because we all get old, ill and die eventually. All need better diagnostics, but not all needs a new car or new computer or new gun, or new chat application.
https://en.wikipedia.org/wiki/Technological_applications_of_...
https://www.sciencedirect.com/science/article/pii/S277283072...