..and yes, I'd prefer that the ruling was that the online retailer had to get a business license in every state. That ruling would create such a torches and pitchforks situation from citizens suddenly having their lives disrupted that we'd quickly return to status quo.
That is the worst possible reason to enact a law. It should be obvious why making people's lives worse purposefully for political posturing is a bad idea, and you run the risk of your plan backfiring and having to live forever in the now-worse world.
Suppose I the owner of a small retailer based out of Oregon but have a location in Ohio. Should I be exempt from collecting sales tax simply because my company is registered and HQ'd in Oregon? The previous ruling was no, Ohio has the right to require my company to collect sales tax for sales in Ohio, but the ruling required that my company have a physical presence in the state. All that happened today was that the requirement to be physically present was dropped.
I mean the law is fairly narrowly scoped and certainly doesn't give states a blank check to write laws for citizens of other states.