I feel MOL (though it's completely in character) is a bit off nailing his colours to the mast like this. A couple of 73-700s or 73-600s even (and Mr. Boeing would like to sell some of those god knows) would be good for new route proving as the 732s have done. By restricting to 738s he is going to have to take some pain for each new route until it reaches capacity, and again once frequency increases.