I don't think the computer resources needed for Stalin's Fourth would currently be a big deal either. As BlauK mentioned, that was two years ago. An $80 graphics card today is like one of the better ones from two years ago.
As for the GV aspect, I am thinking some new thoughts (after a discussion with Roscoroo the other day on this topic). Previously, my opinion was that most AH players don't like GV's and thus that scenarios (usually) should not have GV's, should minimize use of GV's, or at least should have rules that enforce rotation and ensure limited time for any given player in GV's.
However, Roo pointed out that there are a fair number of GV'ers these days in AH. On any given night, you can find a fair number of people in GV's; and when the map with Tank Town is up, there are lots of GV'ers. My thought now is that we might be able to have scenarios where the GV role is one people register for -- and those who register for GV's are the ones who will be in them, not people who register for aircraft and who don't want to be in GV's.
I must say that, prior to Stalin's Fourth, I had no desire to be in GV's. I was willing to do it to help out, but I really wanted to be in aircraft. However! -- I had an absolute blast in GV's in Stalin's Fourth and would be willing to play it again being in GV's the whole time! For me, it was a very, very fun scenario.
So, maybe we have the player base now that would allow sign up for dedicated GV'ers. If not, then I think we can put in rules that enforce rotation and guarantee that players will only spend a limited time in GV's.