The Big Picture

[IlPalazzo]

Although I like the idea of more strategy and broadening support roles, a more defensive oriented game would likely make the game longer than it already is, which is undesirable to most players.

Let people play the version they want to play, or just stick with my suggested idea, build it, and see if its popular, you don't lose anything by trying

Time my friend, time... Coding and adding all those units, abilities, etc. take time - time that can be spent elsewhere on the game. It'd be better if you modded it yourself and saw how it would work, because the changes you're changing would change the mechanics of the game drastically. Maybe it'll turn out good, maybe not, but considering most players like the general gameplay the way it is, such overhaul of the game would be risky move at best for the DevTeam.