Read the Ginsburg Dissent. The wholesale use of the Commerce Clause to limit personal liberty is frightening.
And this ruling isn't?
Think about it. According to Roberts, this activity is prohibited under the Commerce Clause but acceptable under Congress' power to tax.
So now, they can do just about anything as long as a tax penalty is involved. The taxing power just became the over-arching power in the Constitution. Heck, they could gut just about any other section as long as a tax is involved.