I'm OK with two. :-) I read you about the armor, though I wouldn't say it is impossible. If we wanted to, we could armor a ship far better. The problem is that we don't want to, for some reason.
The true irony, is that the big battleships are far better able to deal with any of the modern threats of missiles and torpedoes than any ship we have afloat. A modern Exocet or two will reduce a newer destroyer or cruiser into a smoking hole in the water. A BB could likely withstand a few missile hits without being taken out of action.
And it adds a different kind of threat.