A 40-year-old male with rheumatic arthritis and pulmonary interstitial fibrosis is on maintenance steroid therapy. For the past week, he has had a cough with slightly purulent sputum and low-grade fever. Over the last 2 days, dyspnea has progressively worsened. Examination reveals marked dyspnea, cyanosis, and widespread crackles in both lower lung fields. Heart rate is 110/min with regular rhythm. Arterial blood gas (ABG) on room air shows pH 7.48, PaCO2 30 mmHg, PaO2 45 mmHg. Despite aggressive treatment, dyspnea does not improve, and mechanical ventilation is considered. Which of the following opinions is most reasonable?