That would certainly cause Turkey a lot of grief, too; but it sounds like it would take awhile to get rolling. If Turkey is going to try and do the same thing the US and NATO did to Libya, Assad will want to strike quickly before he loses the capability. After seeing Qaddafi's fate, I suspect that Assad will not surrender and will try to take as many of his attackers as possible with him.
While he might or might not take great pleasure is slaughtering random numbers of Turks with missile barrages, launching those missiles is a surefire way of guaranteeing his own demise, because that will trigger a Turkish invasion that he will surely lose. Gaddafi fell because too few were willing to fight to the death for him. Syria's Alawite, Druze and Christian populations (~30% of the population) know that they will be exterminated if Sunni Islamists take power. As long as Turkey does not invade, Assad has a strong chance of staying in power, because these minority populations will stand with him to avoid being slaughtered in the event that the Alawite regime falls.