When you put it that way yeah that does make sense... do you know what this theory was named so I can go have a read? However there are differences between the viral protein shell and nulclear membrane, but then again you could argue that the protein coat is just like a membrane for the virus as it surrounds and protects it just as nuclear membrane would :O

Yeah it is pretty interesting, and if it turns out to be true that would completely change everything, especially evolutionary theories on molecular levels