What you're asking for is the SEA which is already setup. If you haven't got time to fly the SEA, then perhaps the AvA is ideal. If the AvA isn't being populated, what do we need to do to get more players in the AvA?
In recognizing a bad idea for what it is (and I have more than my share of those)
I'll try to explain my reasoning behind it.
The AvA arena as I understand it (correct me if wrong) is one in which you can show up and play at any time. It is set-up for axis vs allies plane sets but doesn't not require prior registration, supervision, staffing during play, does not have specific launch times etc, basically like any other walk on arena except the different maps and country appropriate plane sets etc.
It can depict certain scenarios with the type of maps etc, but is essentially not a cm organized, non scripted event.
The SEA is one in which structured, scripted events are run at specific times, requiring supervision during play etc.
I suppose what I was describing is a hybrid in that it would still be a walkon, non scripted arena, but would be open for example: only on monday.
This would not necessarily increase the overall numbers of people that play there, but would be an attempt to get them there all on the same day.
It would give people a day to expect something to be going on there and a specific day for people to plan on playing there.
I know it's comparing apples and oranges but you wouldn't run snapshots by saying "The SEA is open 24/7 so pop in any time and when we happen to see that we have enough people in at the same time we will run the event."
I suppose I was thinking it might be easier to increase the level of play there on one day a week as opposed to over all. Making it more like an event might generate a little more excitement.
Instead of people thinking "we have all these arena's available so we'll just play in the one with the most people." people might think "Hey it's AvA monday, let's check it out."
It may be psychological pandering, but one way to create a run on something and increase the value of something, especially in a limited market, is to make it less common.
I know it will never have LW numbers, but I for one, would rather see an arena that was hopping once or twice a week than one that was mostly empty 24/7.
I also believe that the more players that are in the arena, the more will be drawn to at least try it.
I suppose this is the wrong approach.
If you can 'help' figure that out, then perhaps that will help fill the arena.
If I can think of other ideas, I'll suggest them directly to the AvA people. I think about it often, but as you can see, I haven't come up with anything practical yet.