One occurrence per day is not popping in and out randomly. Sorry you're not seeing things in the correct proportions. The arena shutdown and resulting block from getting to orange however is a game killer to many and people just log off as a result.
We've got to be talking about two different things, or you're really, really not getting why this is a bad idea. Let me throw out a scenario, and you tell me what I'm not getting. Let's assume 200 people is 'critical mass'.
Afternoon, 150 people on. We have one arena yes?
Orange: 150
School lets out. 100 people log in, total 250 now. I'm going to assume it splits evenly, yes?
Orange: 125
Blue: 125
People finish dinner, another 100 people log into Orange. What happens now? If it splits, that's twice in an hour 50% of the people in the arena have been relocated. Still, you'd wind up with
Orange:113
Blue: 125
Pink: 112
at that point.
Now, at this point, let's say 50 people from Pink decide they've just GOTTA be in Orange, so they log out of pink and back into Orange.
Orange: 163
Blue: 125
Pink: 72
As the evening progresses, another 50 people show up in Orange, so it splits again.
Orange: 106
Blue: 125
Pink: 72
Fuchsia: 107
That's 3 times in an evening that half of your buddies and enemies have disappeared at once, and this is good for gameplay?
Now let's say 50 from Blue want to go back to Orange, and 50 from Pink are sick of the low numbers and want to go join the crowd. So it splits again?
Orange:103
Blue: 75
Pink: 22
Fuchsia: 107
Mauve: 103
By the by, one thing I haven't even touched on, what if the countries are grossly imbalanced? Let's say of the 250 people in the arena when it splits, 100 are Rook, 100 are Bish, 50 are Knights. Does it take the same percentage from each and throw it into the new arena? Going from 100 friendlies to 50 isn't so bad. Going from 50 to 25 is going to pretty much nullify your ability to do much of anything.
As I said once the other side gets low in players, people _will_ migrate to the larger server as they do now.
...or milkrun like a big dog.
You have quietly glossed over my questions about the ground war. What happens with the state of the fields when an arena splits?
Wiley.