Think they don't mind dealing with him, just that Airbus having publically announced that they didn't want to sell him aircraft for silly money, rather took the wind out of his usual "school of hard knocks" negotiating tactics.
I am sure either manufacturer would be more than happy to do a deal, but this time at the "right price" for THEM , not him.
Think he is too involved with Boeing to make a 2nd type work, extra uneeded costs/complexity (God knows what Norwegian are thinking about ? ) & Seattle know it, hence their tough stance this time around.
Of course, he may have looked at the current European "situation" & decided he actually doesn't want to expand any more, & Boeing are giving him the opportunity to do it without losing face.
The real test of the Ryanair business model will be when expansion stops. . . no more half price Boeings which can be sold at (or close to ? ) full whack, therefore filling up the bank with loads of cash. It could all yet implode horribly, I really wonder what Norwegian are seeing in the future to inspire such huge growth, maybe they could share their theories with the politicians/bankers.