Armor wouldn't solve raider's problems. He doesn't have an issue in 4's where armor would be helpful.
His problems aside from attack speeds are the fact that his soft feint isn't threatening because you can dodge to avoid either the raw attack or the soft feint.
Addressing that and his speed would be a good buff. i've also seen it suggested that if his opponent lets a raw heavy land it should let raider get a free light.
I'm fine with whatever they choose to fix him. So long as they nerf his dodge into gb to be in line with everyone else.