Antiquities Trade Centre cut-off? Will the Trade STOP?

Manbij under ISIL rule, centre
of antiquities trade

Manbij city, and its presumed ISIL Diwan al-Rikaz is now fully encircled  http://i.imgur.com/8nEXWtY.png  . Will the flow of lootyed objects stop? Will the US Department of State now stop using their ISIL is financing itself from looted antiquities argument? Will the trade now be in new hands?