I'd love to see the potential flight times though. It's still going to be possible to fly possibly SIN >> JFK and avoid the extra time on the ground or possibly even SYD >> JFK - or to any other US destination. I'm not too sure EI has strong enough footing for a transatlantic boom. If it was a more viable option - we'd be seeing far more BA etc flights going LHR >> Ireland >> USA - but we don't.
The time lost on the ground is going to be too long for a widebody landining in e.g. SNN which will have, to be blunt, some people which will be having 'random immigration checks' and so much more - it clogs the whole system up. May as well as just dump them in JFK straight off and let the USA deal with them there and then rather than a hub airport where you are based at and they will just throw the pax right back at you.