I would actually disagree about Atamara. Atamara is the "plain vanilla" island, really. It has no special features. If you want a monster heavy island, go to Dwilight. Or go to BT and start tossing around some scrolls. Monster spawns won't help Atamara. The big realms will barely notice, and the small realms will get 1-2-punched by the monsters and the MiCE.
This is my biggest concern: that powerful realms will be the most equipped to deal with these new menaces, and that they'll be even more able to dominate the continent.
To prevent this, we must make sure that hordes remain small and well spread-out, so that it's their presence more than their strength that is a nuisance, and that this nuisance scales proportionally to realm size.
Large hordes would just stomp the weaker realms and ruin PvP.
