We'll be all flying props in the future it seems:
Prop Planes: The Future of Eco-Friendly Aviation?
However, SAAB seems to have a winning formula and looking at potential cost to come up with revamped design the non-recurring cost will certainly be smaller than that of a new design.
Non-recurring Engineering
Tooling
Development Support
Flight Test
Recurring Recurring Costs
Engineering
Tooling
Manufacturing
Material
Quality Assurance
Geek: I think this is precisely SAAB's strategy looking at where their current models are operating.