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.
A better plan would be to fire their missles at Israel. Sure, Israel would likely pound the hell out of them. but the rest of the Muslim world would have to rally to Assad’s side. They coudln’t afford to be seen as stabbing a frontline state in the back while they are fighting the hated Jews.
Too bad for Saddam and Khadaffi they didn’t have a border with Israel.