Lets Get Real:
It can be argued that France should call a NATO meeting and invoke the article that means that there has been an ACT of War on France and that the allies should come to the help of an ally. This would mean ground troops for Syria, of course the liberal left in Europe and the US will go bonkers. and the White House would hit the roof, but it might be the pressure needed to get Obama to see the real world. One has to postulate that the security services of the UK, USA and others will be on high alert in case there are further attacks on Western Countries. This is the time to ACT, otherwise there will be more murders committed by IS/Daesh.