According to the traffic adn.entrecard.com receives, which is the subdomain/server the ads/widget are served from, about 905,000 unique visitors were served. Now, none of the traffic is exact, and they could certainly be reporting higher numbers, but the trends are right in front of you.
Last year, the site was serving nearly two million visitors, traffic declined dramatically from March to June, and leveled off (compared to the height of the decline) through November, and if current trends continue, there will be another 150,000 visitor drop this month (January).
In the end, have you noticed traffic from Entrecard declining or are these figures not representative of what the network is still serving?