The Nexus to fight back!
I think the current structures in league of legends follow very old concept and need rework to make the game more interesting
Why follow the original dota concept? I think it be cool if the Nexus would feel like an epic boss not just some mindless structure that stands there and all it does regenerates health. You would need your entire team to be able to destroy it. Maybe give it some abilities to support this idea similar to Baron Nashor and make it tougher to take down. Smite and Dawngate implemented this idea and it felt great, unique and different than other mobas. It felt like something worth taking down