Strawman. No one is suggesting adding extra stress to healthcare workers. It's also not you or your doctors call to make: let's gatekeep this patients cancer because our hospital can't deal with the workload. What a truly wicked idea.
To help alleviate the extreme shortage of available healthcare workers we should instead allow those wanting to pay for these elective surgeries, to pay for them! Drive money into healthcare, scale up treatments, drive money into research. Let the system work.
Don't just turn off the lights and shut the door.