I'd hope he wouldn't.
But whilst I don't think it's likely, it would have to be a consideration wouldn't it? If Australia said "look, we've made a mistake here, it should have gone to you in the first place" and they give the assurance that he'd have the whole 4 years to build to the next World Cup... it sounds attractive. Add to the mix that English Rugby is on it's haunches...
If you were a conspiracy theorist, the lack of hunger in the first half on Friday night was right out of the typical Tigers playbook of the last decade of being lackluster on a Friday night, something I thought we'd got past under Steve. Maybe, there are rumours flying around the dressing room at the moment. Don't forget the players only got told last minute by Steve.
I really don't think he'll go, but I also don't think it would be an easy decision. I'd imagine the club would benefit financially from it, and I also don't think there would be negotiation, more a "this is how much it'll cost, pay it, or don't."
You never know, in 6 months we might all be wishing that he had gone!!