The Dutch were quite friendly with the Germans at this point.
This would also undermine British reasoning for entering the war - they entered the war to defend Belgian neutrality... they would lose that moral high ground by violating Dutch neutrality.
By the Entente Blockade, are you referring to the blockade of Germany, or is the Entente now blockading the Netherlands? If they are blockading the Netherlands, the Dutch would likely see it as an act of war, and the Dutch army would likely engage against the British and French.
The friendly relations between the Netherlands and Germany would run counter to this kind of agreement. Germany historically is a huge trading partner to them - renouncing neutrality and breaking friendly ties with Germany would -not- bode well for them. This is also pre-WW2, and the Dutch still felt themselves as "brothers" or "cousins" to the Germans.
In short, enough pressure, and the reverse would happen - the Entente would be strengthening the Central Powers, and add -another- army into the fighting, which might just be enough to break through to Paris. It's even more possible that Germany may counteroffer in this case, and offer to give the Netherlands Flanders.
You are also going to see the relations of the remaining neutral powers towards the United Kingdom plummet. If it is believed that the Entente is willing to attack neutral powers to "open up fronts", you are going to see a very nervous Switzerland and Scandinavia.