In theory mars its perhaps possible.
I suspect the real reason is HT has no interest in that area. But thats just my opinion.
Same reason he won't do a Korea era sim.
Even with player contributions, such as terrain, plane skins, etc. I still think it would stretch HTC to the edge.
Those 7 people have worked VERY hard the last 1.5 years to keep AH1 running & get AH2 close. I suspect it will take another year after its released to get all the planes in, add some new ones, troubleshoot etc.
Don't get me wrong, I'd love to see HT come in & say his next project after AH2 is going to be a WWI sim.