I think a way to increase the completion rate would be to make it easier for the students to find a study partner or group for the course. To get the extra motivation you need. An idea would be to connect to your study partner via Skype.

An example MOOC Station would then look something like this.

With the Skype connection on a dedicated device like a smartphone or tablet. You can keep it running for the whole session without interruptions and why not take “fika” break together every once and a while.