‘You forget that the Turks fought in Korea and that Douglas McArthur called them the “Bravest of the Brave”.’
The Turks have a history which is often reprehensible, vile, and alternating between barbarism and decadence, but they have always been a martial people with an impressive track record.
1. Germany has a reserve system that will quickly augment their numbers in the event of an attack.
2. The Turks will be in the attack, which requires a significant numerical advantage to be successful. The Turks have large numbers but not in the scale of say, the Red Army.
The combination of determined defenders, difficult and defensible terrain, the Luftwaffe's ability to strike the rear areas and the critical logistical lines of support - and the US Armed forces potential contribution - would rapidly overcome any idiotic attempt by Turkey for open aggression.
Their only viable tactic is what they are doing already: pushing countrymen and correligionists into Europe to breed themselves into the majority.