We overpay for healthcare because we must pay, and it has institutional and natural bottlenecks which restrict availability and choice.
MRI machines generally run close to capacity because of how expensive they are. There is very little slack.
Cancer treatment already costs a fortune.
The ease of availability of same-day MRI services in London suggests to me there's quite a bit of slack here at least.
EDIT: Though one solution to preparedness for temporary capacity issues without as much over-provisioning everywhere: Mobile suites. My local hospital currently has a mobile MRI suite parked outside to clear their backlog.
When hospitals routinely operate at 120% and a major crisis doubles what we ask of them, people don't get the treatment they need.
I'm sure most of us have stories of friends or relations who needed hospital care during COVID and received less care than they normally would have received outside of the crisis.
A lot of people don't realize how stretched hospitals are these days.
The newspapers in Britain regularly run headlines about people waiting for hours, days, or even so long that they die on a gurney in the hallways.
It's better, but still problematic in the U.S., though for different reasons.
Here, a lot of people wait the hallways for hours and hours because there are simply not enough doctors, nurses, and support staff available. People look at a shiny hospital building from the outside and think it's brimming with doctors and patients. Often, it's not.
There can be many unoccupied rooms in a hospital simply because there aren't enough people available to meet the standard of care required to occupy a room. That leaves patients to wait in the hallways until the next shift change, and maybe there will be enough staff available to move a patient into a room.