On the other had this gives reason to strike before they get set up if the Russians have fixed the Syrian bug.
There is no Syrian bug. You are falling into the trap of listening to media hype. There is no magic button to take down an entire air defense system.
The likes of SA-10/20 and SA-15s are taken extremely seriously by the likes of the Israelis, U.S. and NATO. The Israeli’s themselves know bitterly through aircraft losses to Russian SAM systems over the years. They don’t take the threat of the latest Russian systems lightly.