Nor do either manufacturer want him flooding the 2nd hand market with his wares reducing the fleet values and the knock on effects this has to the leasing market.
This is spot on. MOL got is 737-800s at a big discount but will now be stuck with them. Boeing and Airbus need as many airlines to keep in business as possible and giving cheap planes to MOL just kills other orders.
The best thing for Boeing and Airbus is for Ryanair to go under in 5-10 years time. This will allow for many new startups and the refleeting of the old boys.