Solving issues like this sound good on paper but isn't in touch with reality and would only save a minute percentage. ER encounters only account for
~12.5% of health care expenditures in the US, and a total of
2.4% of expenditures are spent on medical issues that didn't require an ER visit, but the patient did visit the ER. Many of those cases could be handled as an outpatient, which would save money, it would still require some amount of money to care for those patients. While non-emergent medical issues being evaluated in the ER is a problem, trying to fix it isn't going to rectify the US health care system.
If you want to make a major dent,
30% of health care expenditures went to administration. That's what private health care insurers are right now, middle-men who add significant bloat to the health care system, where other systems like Canada spent
16.7%.