The threat is very real. Over 15,000 Turks were killed fighting with Kurdish seperatists from the 1980's onward through today. The Turks will not and do not mess around when it comes to Kurds.

Now, will they actually do this?

I don't think it's posturing at all. I also don't think it will lead to a regional war - unless the Iranians and Syrians join in with attacks on their Kurdish populations - and then we are in a seriously tight spot. The Peshmerga will fight the Turks first, and the PKK second...ethnicity will win out.

Don't want to lay odds on the situation but there is no love lost between both sides here.