Not to mention that the game can barely manage the amount of players it currently has. Imagine the number of "disconnected to cheat the rating system" posts we'd be inundated with? There needs to be several solutions to several problems with multiplayer and we haven't scratched the surface. We still haven't resolved the issue of macro mods. Imagine throwing thousands of more n00b players into the mix. 

This is an important one and the first thing to come to my mind when reading the OP. Passive bonuses, even if not as "lucrative," are generally better because one can use the APM you'd use on a corral for something else. An Ice House is a "build it and forget it" feature. Not so with a Corral. Similar to the difference between a Global aura vs. a Ranged aura for heroes. Global auras should always be weaker than Ranged auras, and vice versa. 

Athenian Hero Roster. Guess who they are?          I think it'd be fun to add a bunch of other, non-trainable heroes to the game, if only for the Herocide game mode. Alcibiades, Aristotle, and Demosthenes would be great examples. 

A first draft, some names are quite difficult to interpret in Proto-Germanic (PGmc) Historical names Etymology Meaning PGmc reconstruction Claodicus *hlūd- + *īk- "Powerful through his fame" *Hlūdagīkaz Caesorix *gaizaz + *rīks "King of the spear" *Gaizarīks Teutagonus *theudō + *gunthiz "People's battle" *Theudagunthaz Cotto *kath- / *kott- "The fighter (diminutive)" *Kottō Deldo *dal- / *del- "The shining one or the sharer" *Deldō Atès / Atas *attō "Father (honorific title)" *Attō Nasua *nas- "The one who has a (large) nose" *Nasuō Cimberius *kimbra- + *-jaz "The one of the Cimbri" *Kimbarjaz

Iterated