Kismet, I think your idea of expanding the service is not only spot on but in all honesty probably the saviour of the service based on the dwindling numbers we have witnessed this year.
I do however think it's a bit short sighted to label this as a 'tourist only' attraction, we know loads of Fethiye workers who live in Calis and Gunlukbasi who may use the water taxi if it was a bit cheaper and especially called at a few more places.