That kind of observation would have a much more dramatic impact, because it would imply that the theories about what the CMB is are completely wrong. The CMB o

That kind of observation would have a much more dramatic impact, because it would imply that the theories about what the CMB is are completely wrong. The CMB originates from what's called the surface of last scattering. Prior to that time, density was such that photons couldn't travel very far without being absorbed. During that period, matter was in an ionized plasma state, consisting of free protons, neutrons, electrons, and some light ionized nuclei like deuterium, without any bound electrons. In this scenario, there were no objects bigger than a light nucleus. It would be impossible for stars or galaxies or even dust particles to form in that situation. Reinterpretation would depend on what the evidence was. This isn't an area that we're particularly unsure of. There's a very comprehensive theory of the evolution of the early universe, supported by all the evidence we have for quantum theory. I recommend Steven Weinberg's book The First Three Minutes if you're interested.