I think they will be as successful as they were the last time they tried this. That's when Israel GOT the Golan Heights!
Syrian armor came within a breath of breaking through the Israeli defenses in the Golan back in 1973, but was repulsed in a heroic effort by outnumbered IDF tanks. The battle was the stuff of legend, and is studied in leadership courses all over the world (except in Muslim armies, I'd imagine).
That said, Syria's surprise attack was launched from the high ground now occupied by the IDF. The Golan Heights is among the world's most strategic military locations. Beneath it, across the plains to the east, Damascus itself lies bare -- which is why Israel has refused to return this captured land to Assad or his boy. I doubt Syria could take it back from the IDF at any cost.
the problem for syria is that this time, the israelis have the high ground ;)