Let me get this straight. From now on, if any archeologist - anywhere - discovers anything, that's good news for the Book of Mormon because it proves that all the discovering has not yet been done? So maybe, because archeologists found a bit of wall in Jerusalem, there's still evidence to show for a major American civilization of millions of people?
Actually seth, this is how real science and real scholarship proceed, by admitting that all the discovering has not been done and that all theories are tentative forever. My brother in law Mark used to tell me that Nazareth didn't exist, and that this was part of the mythology that had grown up around Jesus. When he had been in school, it apparently wasn't known. He didn't keep up on the relevant scholarship and time passed him by.
Far too much of what goes on in the humanities is the protection of academic turf and of intellectual agendas. The whole enterprise would proceed much faster and more efficiently with much less hubris and a great deal more humility in the face of the vast abyss of what we don't know that stretches before us.
The discovery of Ebla should have taught academic dogmatists who criticize things like the existence of Book of Mormon cultures to dig more and talk less, in my estimation.