The MA is a late war world, with perk planes coming it's getting even worse. Some of these early war birds that were so historically important wouldn't and couldn't survive in the current MA. Thus, all Hurricanes and BF-110's would be pretty hard pressed to make any effective contribution in the MA. Some of the current crop of planes have a pretty hard time in the MA already.
They all do deserve to be modelled though, it's just a matter of time and when the initative is taken I bet we get a HA at the same time. It's great to talk about P-40's, P-39's, etc, but how would one of those do against something like a C-Hog or Me-262... geez. The US had tonnes of late war stuff, major classes and variants (or so my knowledge indicates), thus we tend to have lots of US iron in AH.
I think your chances of seeing later war birds is far better than seeing a early war bird at this point. Trying to roll back the clock on the MA just isn't going to work and people will be screaming even louder for a HA (not that that's bad).
Your point is probably accurate flakbait that the US planes have more test data around, but I think that the major reason is that the US had so many late war planes that they are bound to have more modelled in a late war MA.
Maybe I'm wrong, I sure hope all these planes that have been mentioned in this thread and others get modelled, but I just can't imagine some of the truely historically important aircraft even showing up until a HA arrives... they just wouldn't stand a chance so why bother. A hardy few may fly them from time to time, but it'd become more and more frustrating until you had to revert back to something competitive (i.e a late war ride).
-Soda