I guess an aircraft bringing down cost would be slower, like a Q400 or even lower making it less suitable for longer flights.
Engines : modern scimitar baldes and 2200hp per engine.
Max speed 340 mph (540 km/h) ? Range 2000km / 1200nm?
Would you want a turboprop for those speeds, or infernal combustion engine? How would a brand new designed and optimized infernal combustion engine compare against turbine?