Your assumption would be incorrect. There is a surface of last scatter only because the universe was once very hot, but expanding and hence cooling. When it cooled below x degrees, the bare hydrogen and helium nuclei could finally hold onto passing electrons they captured without the heat radiation knocking them apart again. Thus all the charged particles, which interfered with the propagation of light, joined and became neutral atoms, which didn't interfere. No more scattering!
Originally Posted by Jens
Everyone is entitled to his own opinion, but not his own facts.