These days, most of my play is around 11 pm US Pacific time (4 pm Melbourne time), and it does sometimes get hard to find fights. It gets harder as it gets later beyond that, too. So, I can very much sympathize with the Aussies, Kiwis, and Japanese.
Also, it is annoying to go on at that time, see no sizeable fights, yet see a sprinkling of goofballs flying around by themselves, spread thin over nearly the whole map. Who are those people, and what the heck are they doing?
So, I, too, think it would help to have the fight more focused, but how is that best accomplished?
HTC can't run small maps always, or during the times where there are 500 people flying, it might get too cramped, or one country overrunning another completely might happen more frequently than is fun for most people.
There used to be a capture order that focused fights into smaller areas. I really liked that, but clearly it wasn't highly popular, as that went away after it was tried out for a while.
As a person who runs special events, what I typically do to focus the fight is have planes and vehicles available only in some smaller region and not the whole map. So, I'd probably try that -- start disabling more of the map as numbers of people in flight decline. But then you have to be careful of what to do with task groups. If someone sails one off into a region where the opponent can't up anything, you have a problem. So, it would probably also require disabling launching anything from a task group that strayed outside the active-fighting area.
It's not a small thing to figure out all of the ramifications of any such implementation or to code it up upon concluding that it has a good chance of working, though.