Hospitals want to get payment for treatments. Hospitals want to treat people. The more people get covered through things like Medicare, the less insurance companies make, based on all data ever collected on the subject. The government offering to pay for treatment directly also gives the government more price setting power and REDUCES GOVERNMENT SPENDING on medical. This is not an assumption, this is proven fact.
Therefor, everyone except for insurance companies benefit. Waiting times are a non-issue for me if it means more people get treatment.