I think this is why most people buy sims like IL-2 and DCS, so they can play single player missions/campaigns, not to fly online.
I don't know how some of the stuff you said would go over with potential customers

, but you are dead on here.
I can't remember what Williams mentioned, but it was a big number like 85% of their revenue came from single-player. That is why they are starting with that. Build a player-base, build momentum and hype, build a revenue-base to fund the MP which will always be less volume. No bucks, no Buck Rodgers.
IMHO, that is a big competitive advantage DCS and IL2 have over AH. They don't have to fund their development from MP. They have SP funding to keep development going in ~2 year sprints.
WT makes MP only work, but they are smart about how they use FTP to keep servers full and to maintain contact with a potential customer for as long as they can, not just two weeks.
[Edit] Contemplate this point: a kid can be bought a game for x-mas from grandma or someone; it is a much harder sell parents on agreeing to an open ended subscription. You could have a gift certificate for 3 months of play or something, but a parent knows that either locks them in or schedules a fight in 3 months when they don't want to pay anymore. Great Battles of Stalingrad is a single purchase with no strings attached. Much more likely to be a x-mas gift.