Off hours it's around 50 give or take
I would almost be happy if it was that way. Currently, the numbers at off hours range between 10-20 (Euro morning, but with sometimes only 3 or four players actually active) to about 40 (Euro prime time). To get a glimpse of the action like it used to be in the past, I have now to stay up to 4 a.m.

Concerning ground combat, a quick glimpse at played hours shows that there hasn't been a huge increase at all. Overall, players still spend >70% of their sortie time in the air. Unfortunately, the ground activity has been largely reduced to a hide and seek game, especially during off hours, where it's sneak-a-base by large. True large GV battles are mostly extinct by now.