Its been two years since I flown Aces, I've been itching to come back every day, but the current loss of subscribers and no update has me kind of sitting around waiting. Steam would not motivate me to jump back in Aces - I think it would just help generate a few more players - however as AkAk pointed its not the promise land... Aces High has a steep learning curve, it might do more harm then good considering many just want to "point and click" as dayz standalone found out, many flocked to H1Z thinking it was the promise land only to get reamed by cheaters 24/7.
DayZ has the same problem as Aces - were all waiting for the final product, however many wondered off to other games for now as I have. I've always been a fan of Aces, critical in some areas (gameplay) but I think it would fair well on Steam.
I built this computer I am on now mainly because of Aces High; even bought a thrustmaster Warthog which only was used for three months - I think that says more then enough itself.