On the Buff and Twin Otter there are no loadies. The FE does all those jobs, load planning, cargo loading and unloading, cargo securing, weight & balance, pax handling, dangerous cargo, meal preps etc... The point is that FEs do have the skill set to do those jobs, plus we bring A/C servicing and maintenance to the table as well as the maintenance realease authority qualification. The cockpit / checklist handling is just one of the jobs we do. With the new A/C coming on line the job of the FE in the cockpit is diminishing if not disappearing altogether. In those remote locations away from MOBs someones going to have to fuel, check and carry out minor repairs on these new A/C. There are always those occasions when that third set eyes/hands in the cockpit are invaluable i.e. emergencies, low level nav, etc...
As for how these new A/C are going to be manned is for higher HQ to decide, but I think FEs bring a lot to bring to the table.