The defence industry alone won't be enough to fuel the entire Turkish economy. Especially not while Erdogan insists on pursuing Islamic finance, ignoring the tools offered by a sane monetary policy. Turkey's high inflation means companies readily available cash isn't enough to buy all the needed resources. As a result they have less product to export, further crippling their cashflow. This will be a problem until someone less retarded takes over.
Eh, they have enough trading partners that they can keep their internal economy going, and their control over access to the Black Sea isn't going to suddenly not be a factor. And Turkey does have enough domestic heavy industry, agriculture, fisheries, and resources to remain stable and afloat, and NATO membership means they have security guarantees in many areas.
As I said, I don't like Erdogan, and frankly think that Greece should control Constantinople, but if Turkey isn't going to collapse and in fact is likely to get stronger, then I'm not going to fall for the hype about how screw their economy seems.
The only real concerns Turkey has that they don't have a good way to handle is earthquakes, and that's just because they keep skimping on earthquake coding their buildings as they should.