I concur with your sentiments, it would be good to see more games play through to '42 and later. That was certainly my expectation when this game started, a '41 sudden death for Axis is a long shot.I'll add my voice to those who think its a pity this is ending. As ever you have done exceptionally well - which is reassuring about overall game balance.
We have very few HtH games going into 1942 in a decent state (& you are), never mind past the initiative change.
However with the air war bugs, even if the game had continued then the result would not be that meaningful against how the game is going to play out once those bugs have been fixed. Also I don't have the enthusiasm to play a game for 100 turns more or less when for me the result is clear. I do respect your willingness to play through games and adjust the rules as you go along to keep the game balance working but for me once the result is clear I lose some of my enthusiasm.
Specifically I mean the AS intercept, auto-intercept and GS escorts - they are on the bug list now and will be resolved in due course. I would like to see massed GA nerfed but the game works with that as it is. There was an issue during testing with massed GA being a super weapon because Axis were unable get supplied fighters forwards to protect their advanced units. That has been resolved but now we have a similar effect that Axis can get their fighters forwards but they are not intercepting as they should.
It was interesting to see that AA SUs are not that effective against massed GA. If the Soviets spread out their attacks then the AA can take a heavy toll, but if they concentrate say 3000 sorties against one unit then the first round of attacks will take out much of the AA and subsequent attacks go in with less opposition.