What Rust needs now is toxicity and disease.
Large stores of sulfur, gunpowder, iron, guns, armor, furnace stoking away with ore, the more toxic the base. Productive base = productive toxicity. Place a burden on abundance. This would be inline with the penalties now on large uber bases such as ladders and rockets.
Large groups = rampant disease like AIDS or H1N1.
Make large groups have to work harder to keep their clan safe. Like how hard Solo players have to work to survive. Get rid of the pansies joining large groups to ease their survival or ease their KOs abuse.