I would say that is a bad idea mate, 5 channels is perfectly fine , the problem isnt the channel amount sometimes ,is the way players farm.
We managed with 2k+ players and only 4 channels we manage good now with 5 channels so unless the server has 5k+ players at a time i dont see a reason to open another channel.
Like I said in previous posts, we will manage channels whenever we consider it necessary. If we see a new channel should be created, it will. Just like the other way around, if a channel has to be closed, it will.