All i can say is good luck to them. To be fair, the NRL has taken an origin game in their heartlands for years. But the key with the neutral origin game, is that it is moved around to different cities.
And the same will apply with magic round. For the concept to survive, you have to spread it around. It can't be in Sydney every year. No doubt, they will go to Brisbane. But then again, the WA government could go and bid for it.
They have spent big on that stadium. It would work over there, especially if its timed around a public holiday Monday.
As for the NRL, yeah spread the magic round across the southern states and NZ.