As it should be.
Though this case was cited negatively by the Supreme Court many years later, it is still regularly cited in briefs — including by lawyers on both sides of the recent Obamacare cases.
So just because something seems local doesn't mean it couldn't fall within the Commerce Clause powers, as interpreted by the Supreme Court.
I'm not sure that the proper definition of "interstate" is when the consumer crosses state lines to reach the retail location.
Is the cellular industry not interstate? An American can buy their phone at a local Verizon store and their phone connects to a local Verizon tower. Also, most Americans' ISPs are headquartered and have facilities, through which their traffic passes, in other states.
Anybody know how close to the truth this is? It sounds a bit less likely than I would hope.