Eh? Been a LONG time since I played D2 (years), did LAN play get patched out?
No, the blind Blizz fanbois CONSTANTLY forget that SP OFFLINE and LAN COOP (which ARE still there for D2) had ZERO effect on closed B.Net Diablo, even though THATS their lame excuse for turning Diablo into a rent-a-game concept.
When Blizz decides to turn the lights off on D3 (probably many years down the road), you don't play it anymore because you don't actually own the game.