Haha, that's true, single player is 'static', while multiplayer is (often) 'dynamic'... people doesn't like the same all the time unless it's really good, so a game without MP is expected to die sometime. Personally, I find MP gaming quite more challenging and entertaining, while SP is often monotonous and tends to be boring.
I got the model file, but unfortunately, he didn't have the UV,Can you ask me how to export OBJ files with MTL