You guys are forgetting one major thing here:
Upgrading AH2 to CFS or even WBIII levels means 200+ Mb downloads. That's a multiple of the present download.
AH2 would be a no-go for the average 56k user.
Sure eye-candy is nice, but if it comes with even a slight cost on playability, it's not worth it.
I've never considered a game like WW2OL, IL2 etc. playable on my system (XP1900+,512DDR,GF3Ti200,Nforce) because while it runs ok on most times, there might be 1 second pauses once in a while when the 512Mb ram isn't enough.. Or when making fast turns such as head movements, the movement clearly lags out visibly. That makes turning head an irritating move instead of a reflex action which it should be in combat.
I don't consider a fps of 30 playable at any time.. The fps has to remain over 50 at all times to be able to match the fast action. That means peak fps of 100+ and my system just can't cut it on IL2 FB unless I turn off the eye candy - and what's the point in that?
I say that you should be happy if you get improvements to the graphics, if that means you will keep the superb playability AH has. If the upgrade comes with a cost, that hurts HTC way more than a little outdated graphics engine.