With each passing day I'm growing more and more certain that ISIS is holding their fire in France & the Low Countries to avoid tipping the election to Le Pen. Beginning with Charlie Hebdo in January 2015, the operational tempo for Islamist terrorism in France & Belgium was quite high, if you count small attacks that were quickly forgotten (a stabbing here, a shooting of a single cop there), rather than just the big ticket attaqs (Batalcan, Nice, Brussels, Charlie Hebdo). They averaged about once a month, until the summer of 2016 ended, at which point France quieted down.
Given the scale and sophistication of the Bataclan operation and the jihadi underground in France, Belgium and Germany (this week Belgian police arrested over a dozen people accused of making fake documents for jihadists) I find it unlikely that the sudden decrease in operational tempo is due to exhaustion of resources, like a lack of guns, explosives and willing martyrs.