As an Air Warror Vet I can say this.
AW's WW1 arena was always way under-populated, just like here. AW's Korean war arena was much the same. just not enough interest. Its not much of a war with less than ten people. My thoughts: Keep the WW1 arena if you want. Its already here, but don't waste the resources and time on Korea. Put it all into making WW2 even better.
On the other hand I think "1946" would be a hoot.