Tank assassins will continue to rise in popularity until Riot nerfs the items themselves.

Right now, building one or two damage items then the rest tank items is just too efficient to pass up. I actually see more melee carries building Titanic Hydra than actual bruisers, why? Because items such as these are too efficient at the moment. The same goes for Dead Man's Plate. Riot can continue nerfing each individual carry that abuses this build path, but until they actually nerf the items themselves, another 'Tank Assassin' will continue to rise.