The bigger issue here is that yet again, the assumption is being made that an NRL contract trumps all other deals. The Aussies want Hastings back, so suddenly his commitments in the UK mean absolutely nothing.
For that reason alone, Wigan should hold him to his contract and tell whichever underachieving NRL clubs think he's the answer to all their problems to literally eff off. And if the player sulks - which I doubt he will, as he doesn't seem to be that kind of guy - we just have to grin and bear it.