In game evidence contradicts the population size available to the Dark spear....Gnomes....Tauren.....Forsaken...goblins.
Why not High Elves as well? If Blizzard decide to offer High Elves to the Alliance, your argument covering size is meaningless. There are High Elves in Storm wind, the Hinterlands, Terrokar, Dalaran - that's enough to work from.
EJL