Emergency room doctors have filed a class-action lawsuit against California, saying that the state's overstretched emergency healthcare system is on the verge of collapse unless more funding is provided. Across the state, scores of hospitals and emergency rooms have shut their doors in the last decade, leading to long waits, diverted ambulances and even patient deaths. Doctors say the situation is only getting worse as state officials, struggling to balance the budget, have proposed another $1.1 billion in Medi-Cal cuts.