With a single operator, and with the new capacity the Aurizon rollingstock will provide, it is possible PN may start seeking out the kind of business it couldn't afford to haul when competing with Aurizon. For a start it will be able to offer multiple daily arrival and departure times for the Cairns and Townsville markets, and it may be able to go after more of the shorter haul freight now all on road south of Gladstone and out of Bundaberg with its more flexible capacity.
The crossing loop extensions are now underway, with completion set for 2018. I haven't seen much in the way of construction, but there appears to be a number of loops involved in the project. The choice of running longer trains or offering more departure times will then be up to PN. I guess its up to it now to prove if a single operator can do a better job than two in a low to medium tonnage market.