Not forced. The penalty for not having insurance is just a pittance the first several years -- IIRC $250 in 2014, and increasing quite slowing for several years. At some point the penalty is slated to increase dramatically, but we'll be into single-payer by then.
Also, I heard from our HR folks where I work that the first year will be $95 and then two years later approx. $600. Maybe a lot more after that.
They'll adjust the amount based on mid-term elections and such.