Klein: Feds & 46 States Engaged in 'Experiment'

In the course of trying to discredit Governor Scott Walker's budget repair bill, Washington DC pundit Ezra Klein offers this (my bold):

In English: The governor called a special session of the legislature and signed two business tax breaks and a conservative health-care policy experiment that lowers overall tax revenues (among other things). The new legislation was not offset, and it helped turn a surplus into a deficit

The "health-care policy experiment" to which he refers is the ability to deduct contributions to a health savings account (HSA) from your taxable income.

The federal government and forty-six states offered this tax treatment of HSA contributions before Wisconsin.

If that qualifies as experimental, I wonder how Mr. Klein would describe President Obama's health care reform bill.