Type ratings are not prohibitive to achieve once a pilot has achieved an ATPL. It’s about 5-6 weeks per pilot. Yeah, it’s a pain but it’s also not a devastating road block.
Ironically if you hear some airlines talk about the whole point of MCAS and no extra type rating requirement didn’t actually factor in as much as Boeing thought.
Training and aircraft expense is actual minor compared to fuel efficiency and availability of aircraft. If you’re running 20 year old 737NGs the new engines on the MAX are going to save a tonne of money, even after potential reputations damage. It’s all risk management.
Edit: in regards to maintenance a lot of airlines are outsourcing maintenance to bigger providers so that’s less of a deal than you’d think as well. Fuel really is one of the largest factors in this and an extra 5 years of expensive gas while waiting for a new plane may be too much for budgets to bear.
Edit: in regards to maintenance a lot of airlines are outsourcing maintenance to bigger providers so that’s less of a deal than you’d think as well. Fuel really is one of the largest factors in this and an extra 5 years of expensive gas while waiting for a new plane may be too much for budgets to bear.