Done right, night works just fine. I've done night custom arenas before and made it so it looks like a bright full moon and there was no problem seeing the ground (features, objects, water, etc.) or other players (planes and icons).
Like has been said before, it's not for everyone. Many people have low-end rigs with all the graphic options turned down just so they have acceptable frame rates to play the game, and they might not have the same experience in a nighttime arena as people with higher graphics settings. It would be unfair to force it upon everyone.