The demand for LAN skyrockets to 100% as soon as it isn't profitable for the developer to run a server for the game anymore. LAN (or private server, or direct IP connection) games can be played via low-latency VPN when there is no official infrastructure for the game anymore. Devs like to pull out the excuse that LAN isn't used very often for why it doesn't get implemented, but it's a dishonest answer. It does take development resources to build, and playing with official online infrastructure is in fact the path of least resistance, but the death of that infrastructure is inevitable, and even when it's running, you can run into an issue like Helldivers 2 is right now where it just isn't reliable. If you want to omit the feature because most people never use it, you may as well design cars without seat belts or air bags. Grim Dawn and Titan Quest will be playable in multiplayer indefinitely into the future, because they have LAN.