There were a lot of drivers according to my sources and they felt that film had a longer lifetime than we are seeing. However, to be fair, Kodak was more optimistic than anyone else. And, your comment highlights the failure of George Fisher way back then to not foresee the future, even though he is more charitable to himself.
He didn't dismiss the Technological Forecasting Committee's prognostications nor did he foresee the camera/phone integration in spite of his Motorola background.
A lot went on here that we don't know about.