Seano,
Known you for a number of years. It has always been pleasant no matter whether combatants of wingmen.

It is hard to describe in terms that anyone who doesn't have the schedule that we do, can understand.
This is a list of things that can attribute to the lack luster game play at times.
Large maps with smaller participants, scatters an already depleted force.
Player based criticism of players not country loyal.
Win the war objectives that are not shared by an overwhelming majority.
Only the individuals who pay for the privileges to play have control over their actions.
CONCLUSION:
Dusting off a new shiny toy here and there, will keep some interested for a short time.
Until a new "version" of Main Arena play evolves, the popularity will continue to slide.
Given the addition of the custom arenas, I would maintain my subscription even if the only action during Euro time came from these player based servers.
Other than the friendships that I have developed over the years, I find too often others don't behave the way I wish they would.
The dynamic with large maps, no clear leaders and 3 countries is too complicated for the average player to conform to a set of pre conceived ideas about winning. Thus a third country will continue to fight another country to the demise of its own chances of winning. Maybe their definition of winning is being superior to the force they chose to fight, and not being superior in tactics. Basically, some folks are purely interested in their scores, k/d ratios, possibly ability to fly with an advantage, and not interested in the least what happens to the war.