Ahh, 180min with extension is not a big deal. 3 and 4 engine aircraft will not be as restricted having more redundant systems anyways. To the question above, as far as I know being in the US it will apply to FAA reg acft, expect the world to follow or be onboard. 180 ETOPS is more a burdon on MX... But there will be less rules as negociated with the CAA as there are redundant systems a twin can not provide.