Obscurity doesn't hurt, but don't count on even several layers of it without some rigorous security design, too.
I think if the precedent holds that common carrier is black or white and who regulates them based on that holds, they're going to still be able to offer non-common services. What they really won't like, though, is that this is consistent with the FCC's argument that because they are common carriers and tie non-common offerings to common offerings that the FCC gets to regulate the non-common offerings.
If it is a Miracle, any sort of evidence will answer, but if it is a Fact, proof is necessary. -- Samuel Clemens