It's because of the increase in drug costs. Choices will have to be made. If coverage is comprehensive, if it is 100% covered by the public plan, tough choices will have to be made regarding the technology, which is advancing quickly.
The new drugs are extremely costly. It's possible to treat rare diseases, and chronic diseases as well, with biological drugs, for example, which work miracles but are extremely expensive. I think it's problematic to consider a completely universal plan.