I feel like 1946 arena would just become the new MA. And that's not a good thing, IMO. I really enjoy the immersion, and that would ruin it for me.
Besides, unless you give the jets free of cost, I feel like it would be mostly US/UK planes shooting at US/UK planes, which would be incredibly boring for me.
I mean the Germans have the Do 335, and the Russians have the La-9, and not a whole lot else. The Japanese are utterly screwed, having the A7M and not a great deal more.