I have made this same point before, but feel the necessity to reiterate it yet again. The destruction of Damascus foretold in Isaiah 17 also foretells of limited destruction to north/central Israel as well as to northwestern Jordan.
Most importantly, not only does Isaiah 17 foretell of the annihilation of Damascus, but it ties that massive overnight event directly to the destruction of the whole of Syria (Aram) as a sovereign kingdom.
This is clearly evident in just the first three verses of Isaiah 17:
“Behold, Damascus will cease from being a city,
And it will be a ruinous heap.
The cities of Aroer are forsaken;
They will be for flocks
Which lie down, and no one will make them afraid.
The fortress also will cease from Ephraim,
The kingdom from Damascus,
And the remnant of Syria;
They will be as the glory of the children of Israel,”
Says the Lord of hosts.
When discussing Damascus' coming destruction in no way can that event be isolated or set apart from the full context of the prophetic text.
If we make that error that then we miss the full context meaning and our exegesis of God's Word becomes invalid and fatally flawed.
The bottom line from my eschatological perspective is that when it comes to Isaiah 17, it's all of it or none of it. I'm for all of it, for that is what God said to Isaiah.
UPDATE: Simultaneous with the Wall Street Journal's report Arutz Sheva in Israel published a report stating that former Mossad chief Danny Yatom is on record disclosing to the UK's Sky News that Israel is prepared for the possibility of military action inside Syria if Syrian chemical weapons were to come into the possession of Hezbollah, Al Qaeda or other terrorist organizations in the region. Quoting Yatom, “The conventional wisdom should be that we cannot exclude a non-conventional attack on Israel... We would have to pre-empt in order to prevent it. We need to be prepared to launch even military attacks... and military attacks mean maybe a deterioration to war.”
For its part, the Al-Assad regime denies any such movement has occurred. Syria is a non-signatory to the 1992 Chemical Weapons Convention, an arms-control agreement which outlaws the production, stockpiling or use of these weapons.