Because presumably, a new business might open at some point, somewhere in America.
And as all new businesses developed across America, they would also be subjugate to this bill, upon opening to the public.
Because the business owner should have the right to change their minds. (Whether they are changing to smoking or non-smoking.)
Although they(business owners) may feel they should have the right to change their minds, at least proposed bill would play a democratic part in giving them a choice (at all). To punish the whole class(American business owners) because of the folly and disregard of a handful of people(smokers with no regard) seems moderately communist. Actually seems very similar to a few of my grammer school teachers who were too lazy or intimidated to punish
only those who should've been.
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"Before you criticize someone, walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes."