one thing I've noticed though is the numbers of kills being landed is often 2-3 instead of 5-10 like it used to be and the frequency of landed kills in the text bar is way down inlanded kills but the bomber sorties are showing up a lot.
The average number of kills per fighter sortie didn't change in the past 7-8 years. The k/h is somewhat lower than it had been in 05/06, but that has been a very gradual change over many years and not that massive at all.
this sudden drop in kills. did it start about the time acheivements were added to the game that encouraged players to man the bombers? if large portion of the ah population is now spending time climbing to altitude in bombers you have a big chunk of misleading data that does not show what is actually going on.
There has been no significant sudden increase in bomber time. There has been a minor one, but that has also been a gradual rise over the years with a minor bump when the strats were fixed. But again, this is very minor.
Oh, and the latest sudden drop in kills started in April, long after the achievements were introduced (that actually started lasty ear). Coincidentally right after WT opened the US server. Of course I can't say if it really was the sole cause, nor do I know if players fully transitioned or are just testing different waters

(At this point I got to emphazise again that the chart does NOT show overall player or subscriber numbers. Just combat activity in terms of kills by category)