Multiple sources estimate over 50% of those who signed up last year won't sign up in 2015. Both Bankrate and Kaiser project this. http://finance.yahoo.com/news/obamacare-could-face-large-numbers-101500195.html If that materializes I guess we can safely conclude that more people will have lost their insurance that those who got coverage.
I'll sign up for anything that is free. When they send me a bill, forget it. I'd rather buy an iPhone, or a car, or a pizza, or a college education.