I highly doubt people dropped off because they heard about a $2 price increase through the grapevine and decided to cancel.
Far more likely, people have dropped off in droves as the content continues to turn over at a rapid pace. Stuff I watched last year, last month, last week isn't there any more. The constant turn over makes it impossible to calculate the value. I don't care about their original programming either...to me that is not value.
To me, the value in Netflix is knowing that "x, y, and z" are available to stream at any time...and when I go to stream it and find that its GONE without a trace, the value just went down.
They don't add new content that makes me appreciate the service, as fast as they remove content that was once my reason for having the service.