Turkey does not have a substantial educated workforce to be a large benefit to the EU. The EU has also had a severe problem with immigration and the inability to sustain quality of life due to immigrants throughout the EU. Admission of Turkey to the EU would only heighten this problem. They were not promised admission.
Turkey should not be in the European Union. Turkey is part of Asia except for a very small portion of their country which is in Europe. Yes Istanbul their biggest city is in-between but the capitol is in Asia. I believe that they may be permitted to join but should not be an automatic entry.