You might unferestimate how much more players we did have online for about 1.5 to 2 years after the Arena Split.
After the split we had 800+ online in both LW arenas at the peak for quite some time. I rember that quite well (and made a few notes, as you might expect from me
) That's about 400 per arena, as we have now.
(I also remember HT stating on the BBS that 'last night' there had been more than 1000 players online. I might be able to dig that up again)
As far as I can see, the numbers are relatively stable since going to single LW
I'm not underestimating anything, although I never saw 1600 on as it sounds like you're suggesting. That would be cool to see, but I was comparing current average (400?) to the average at the time I left (500-600).
And one more time, someone apparently believes they can attribute the huge increase to the split arenas. I am falling all over myself trying to understand why a number junky like you buys into that.
Common sense would suggest that they split the arena's in the first place because the population was ALREADY GROWING and leading to what I am told were "cesspool" conditions which of course you don't have now that numbers are low.

MAYBE the huge growth in the game reflected the lightning like advancements and plummeting PC prices during the decade. I'll put my money on this as being the reason.
MAYBE the cesspool conditions that were attributed to too large of a population were actually just the result of a sudden expansion and the "self policing" that is such a biblical principle around here, didn't have time to compensate before a kneejerk fix was applied.
MAYBE if the real problems with the game were addressed that massive influx of people would still be around. For example, the fact that two weeks is insufficient for anyone but the hardest core, ww2 aviation junkies. Or the failed efforts to police the group. etc, etc.