Syria is begging to get them back. It is the most logical thing to do.
That said, no politician would openly threaten war before even being elected. If push came to shove, Umit Ozdag seems like he would have the spine to start an operation if it meant that he could get rid of the refugees. But of course he will speak of a more peaceful method at this point of time.
Umit Ozdag may kick refugees out but he will never have the spine to start a war with either the US or Russia
If he actually did do his promise of kicking the refugees out, it will be by asking Assad to take them back as he himself stated; however, Assad is just doing that to EFFECTIVELY kill each and every last possible resistance against him.
However, there is a catch that many members seem to not notice; if such an event did occur then Turkey will have a PURE IRANIAN and RUSSIAN proxy sharing its borders with Turkey and surprisingly both of these fqs have good relations with the PKK
In other words, All of Turkey's land borders (aside from Azerbaijan) will be shared by nations carrying anti-Turkey and anti-Sunni sentiment like Armenia, Syria, and Iraq. This will be a catstrophe for Turkey as it will 100% lead to internal instability in the long term
That is why as I said, Safe zones are the way to go to ensure a pseudo-sunni state is sharing its borders with turkey to be an ally if needed