I have seen used very similar strategy against me. The Germans sunk my med ships with the planes, purchased AC and a tran. Of course, I was not able to sink AC, BB and 2figs as Hobbes suggests but I was still a happy player because what Germany put on water equaled to 7inf and was doomed sooner or later anyway.
And I suggested wrongly. I apologize because I just realized that I completely misread the post and didn’t account for the German carrier. In that situation yeah, G will have a nice fleet that the Allies won’t be able to do much about for some turns.