If the MAX gets back in the air, its pilots will have to know more about the trim system then anything else on the aircraft and will spend hours in the simulator practicing every conceivable NON NORMAL from a totally revised manual. This is assuming Boeing can modify the aircraft to a standard which satisfies several regulatory authorities.
After a few flights with the airlines CEO and families onboard, there will be a slow, phased reintroduction as aircraft are modified and crews trained. Passenger confidence will eventually return as long as there are no further incidents. Boeing will need to chop the MAX as soon as they can and switch future orders to an up to date design with modern safety features. Getting the MAX back into the air is a short term solution to give Boeing cash flow and breathing space while they come up with a new aircraft, I can't see 5000 of them being produced. As soon as a new type is ready the B737s days are over.