I would not be surprised if the JTSB temporarily rescinds their approval to allow NH and JL to operate the 787 at ETOPS-180 and the FAA may again decide to follow their lead for
PR purposes as they did with the grounding.
On the other hand, considering the 787's testing was trouble-free enough for the FAA and EASA to find the 787 suitable for ETOPS-180 operations and the plane flew without incident for over a year, which convinced the JTSB that the 787 was suitable for ETOPS-180, to issue a new ruling that finds the 787 not suitable for ETOPS-180 operation might call into question again how these agencies certify twin-engined aircraft for ETOPS at EIS and that could impact the suitability for ETOPS at EIS for new twins like the A320neo, A350 and 737 MAX.