Michael O'Leary has started that passengers won't get refunds if they refuse to fly the MAX, and when asked whether people might avoid booking it, elaborated as follows:
You won’t know, because on average you book seats on Ryanair six to eight weeks in advance of travel.
We only do the aircraft allocations the night before, because we don’t know which aircraft is where.
During the first year, you’ll have a 10 per cent chance you’ll be on a Max aircraft.
Will anyone know or care? Frankly, I don’t think they will.
Source: https://www.independent.co.uk/travel/news-and-advice/ryanair-boeing-737-max-plane-crash-passenger-safety-aircraft-michael-oleary-a9255601.html
Now there is a good chance he is making this up on the spot, but given the capacity and seat plan will be different on the 737-8200, and passengers are prompted to choose seats when booking, do we think it's possible for Ryanair to operate the new planes mixed into the fleet like this, as if they were the same as the existing ones? Is that genuinely likely to be the plan? They'll be flying a lot of empty seats around if so, even if nobody refuses to fly.