Had you locked this based on the reasoning that it will never be added, that would make sense, but you locked it for not being serious.
Although it's immaturely worded and has some offensive content, this is a serious suggestion on his part. He genuinely would like there to be an in-game com system, however unlikely the request may seem.
I see no harm in keeping this open, as it will die off on its own due to a lack of interest or lack of feasibility.
It's not good to restrict players' freedom of speech nor their imagination.
That being said, I would like you, Avenus, to remove any offensive material from your original post if you'd like this topic to remain open.
Thank you