The mode for the DSCRL has long been decided.
Saying that however, DSCRL Stage 1 is effectively a extension of the existing Caboolture terminators (and redirected Nambour trains), within the existing capacity of the NCL stretch between Northgate and Beerwah.
Most existing Caboolture terminators effectively become Caloundra trains, and the off-peak/weekend trains to Nambour (with some extended to Gympie North to give more options beyond Nambour) effectively become timed shuttles to Beerwah.
Considering the Gympie North trains are not part of the CRR running pattern, increasing the daily peak Gympie North direct service to 2 or 3 trains in the peak direction (for a total of 4-6 peak hour direct trains per day) could effectively serve as the ‘defacto’ Nambour direct peak trains via Bowen Hills/Central when the CRR opens.