Summary
Despite showing some promise as a shooter, Korkmaz hasn't developed into the elite threat he would need to be in order to become a meaningful contributor on a good team. After hitting 41% from three last season, Korkmaz is down to 37% from three this season, and if Korkmaz is just average from three, he will be nothing more than just a minimum-level player. He has a quick release, and has shown some ability to hit shots on the move, so he isn't just a standstill spot-up shooter. He doesn't defend at a high-level, and just doesn't make enough plays on offense. He doesn't have the athleticism or craft at the rim to be a multidimensional scorer. He's also a poor rebounder. 
 
Cap Considerations
Korkmaz will be an unrestricted free agent with a $1.7 million cap hold and Full Bird Rights. Since the 76ers will be operating over the salary cap, they will retain Korkmaz's Bird rights, and have no restrictions on re-signing him. However, re-signing Korkmaz to something over the minimum could lead to some complications such as significant luxury tax penalties or getting close to the hard-cap if the 76ers use the full MLE.
 
Other teams will have multiple ways to sign Korkmaz as even teams without cap space could possibly use either of the Non-Taxpayer MLE, Taxpayer MLE, or possibly even the Room MLE to sign him. There's also a chance that Korkmaz could be had on a minimum contract.