If IAG take over NAS, there will be no huge up scaling of Norwegian.
What IAG will do is kill it off, and let BA and Iberia continue to grow, and ticket prices across the Atlantic go back up, as people need to travel for business, and for leisure.
It's a threat yes due to low ticket costs, but why would IAG take them over, ramp up the operation and let their bigger elements, BA and Iberia suffer....
Also Norwegians tickets price's come at a cost, the pay and conditions the current employees (agency workers) receive is well below industry standards.
Yes Osm contract may pay well on the dreamliner, but at what price, you do a EZE-LGW flight, land back after 14hrs, have one clear day off, then out the door to Boston! Legal yes, morally right.... Hell no!!!!