I understand your point but the whole logistics is far more complicated.
NSW is not going to fund a rail service down that way, can you imagine the cost of having staff (unless Wagga or Albury is used for XPT crewing), plus servicing back in Sydney, Repairs.....What is there to fund when there will be viable spare rolling stock by 2024. Don't waste time with vline and if the locals want it use the spare rolling stock.
The best option to pay V/line to run a through service from Melbourne to complement the XPT/XPT replacement timetable, it won't be commuter, but thats a failure anyway.
If its XPL, it will be doing assume 1 trip each way AM and PM, poor rolling stock uterlisation, where does staff come from, how to get to Sydney for servicing........ Just think of the overheads to run it. Certainly the fares are unlikely to pay for the cleaning bill. We haven't even discussed which way the train should run A->W or W->A, surely no one is proposing both each way?
Extend an existing train service another 130km or whatever it is and do the exact same thing now, park the train, send the crew to bed.
The whole commuter option is a pointless exercise, won't work there just like everywhere else, so end of story on that. The opportunity is to improve access to Albury to Melbourne. The one and only WW'ite I've ever know personally said his family at least would go to Melbourne before Sydney because back then at least it was easier and faster.
If you put an xplorer on trial service then you will be doing more then 1 trip each way in peak and these trains will not be needed in Sydney and so will not need to come back to Sydney for service. Let one of the heavy maintenance facilities in the area do the work providing continued work for the region.
If push comes to shove these trains could be sent to Bombardier in Victoria for heavy maintenance if need be. There will be enough spare endeavours / xplorers to also provide a daily services to Griffith and back from junee.
200 or so kilometres is perfect for the Endeavours and Xplorers. That distance is their bread and butter just as it is for vlocities.