Honestly, I think wall miners should take double the troop space, but also disable traps. I mean, isn't that what combat engineers do in real life anyway? I know it's pretty much pie-in-the-sky thinking, like any other significant balance change, by this point though.
Though as far as the oil raid dance goes: the introduction of a rapid response type of defender would go a long way. This idiocy where one shooter in one corner of the map triggers the entire defending army to slowly amble over there while a dozen wall miners and 2 dozen raiders beeline to their target is so tiresome. Sure, even that will be countered, but another step in the dance wouldn't hurt.