Comments like this make me cringe because they are based on such a huge mistaken assumption.
Right now your employer doesn't have to provide insurance. He/it/she does because its a benefit that attracts good employees. If your employer wanted to, they'd just stop offering it and be a less competitive employer to potential employees.
That isn't going to change because there is an option to pay the tax. I mean, they could have just stopped offering it, anyway. The law doesn't change that fact.
In fact, if anything, over time the law will have the effect of broadening the universe of people paying. Costs of insurance will go up because health care costs go up, but not as much as it would have if the pool of contirbutors remained small, and got smaller.