[Adam]

Each state determines the consequences. I'm not aware of any state that allows a high school competition to continue in any sport if there are no coaches available.

Each state would also set the standards for who can become a coach. If the AD/Principal/Superintendant/Bus Driver steps up and says they are the new coach, I'll let them (on the basketball court) and assume they meet whatever qualifications are set by my state. At that point, my ejection report would include all the information and I'd let the state sort it out.

Again, that's basketball, and the custom in baseball may be different.