You're focusing on whether the gummit can make you buy something. The facts are that the Founders had govts that forced people to buy specific firearms for militia use ... or pay a penalty. So to say this is somehow never considered by the Founders is bullshit, but that ALL misses the point. We have not had laws mandating one buy something. But OBamacare doesn't mandate one buy. It increases taxes for those who don't.
And if you don't buy a house, you will pay more in taxes. If you don't buy a 401k, you will pay more. If you don't donate to your church/colleg, you will pay more. If you don't HAVE KIDS you pay more. The government uses taxes to coerce behavior all the time. There's no constitutional argument.
What right wing nitwits NEVER consider is this.......
If a non-insured, poor person is forced to go to an ER at the local hospital for diabetes or dialysis, or cancer treatments, do hospitals 'forgive" such visits and NOT pass on the costs to these same idiotic right wingers when they need to use that same hospital???...........Yes or fucking no?