Agree with Karnak. First off, there remains many AH models that need to be brought up to AH2 standards. There remains a lot of aircraft/vehicles (and variants) throughout the course of WW2 that AH does not have in game yet that have served in combat in numbers.
I do not think it is wise to open the door to post WW2 craft. That goes beyond what the original theme and purpose of this game is. Also, in order to really appreciate what HTC (and the players who submit skins of AC/GV's) has to go through to thoroughly research, create, model, and implement the vehicles that we enjoy, you would have to experience the tediousness of it yourself. I think the system works fine as it is.