I think we have to treat the algorithm as a medical tool here, whose maintenance will be prioritised as such. So your premise is similar to "If all the scalpels break...".
Which is easier to build resilient systems for: the one where you have a few dozen extra scalpels in a storage closet or the one that requirements offsite backups, separate generators, constant maintenance?
Sounds like a great system that benefits from having lots of money. IDK how such a thing can last in rural areas where there may be one single MRI machine to use in a 100 mile radius.