If the NRL's threats to take the GF away from Sydney were serious then they would have done it already.
This will be just like the last two times the NRL has had such an agreement with the NSW gov. The NSW gov will break that agreement at their leisure, safe in the knowledge that the NRL will 'compromise' with them, i.e. take it up the arse, rather than follow through on their threat.
We'll probably piss off the Qld gov, and potentially other stakeholders as well, so badly that we'll have to come up with some other gimmick like the Magic Round to make it up to them as well.
At this point it's a joke that the NRL keeps going on with this nonsense.