Assad has won. It's about over.
Why not? The terrorists have been defeated, and any further intervention by any foreign power (Russia, America, Turkey etc.) is not warranted, as it is up to Syrians to chose who leads their own country, not anyone else.
Except Russians won't leave Syria, neither will the U.S., Saudis and Turks cease their involvement. The game between the powers will continue in some other form, at the expense of the Syrians, pawns in their proxy wars.
I mean, they did manage to do that for five decades before the civil war, so there’s no reason why they can’t do it again
