The Assad government, despite calls by the US and UN to step down, does not appear to be leaving anytime soon. Now Turkey is thinking along the lines of Israel, namely they see the situation as a clear and present danger with incursions into their borders. What makes the situation in Turkey different is its membership in NATO. A threat to one member is a threat to the Alliance. Taking a page from the Bush Administration, Turkey probably won't declare outright war against Syria but rather label Assad and his supporters as "terrorists".