Your concerns are valid and I have seen similar drops. What the programs must remember is the odds are very good they will have access to the US market in time and they want to maintain the strong relationships they have now with affiliates. I would hope they wouldnt “cross off” affiliates who were heavily weighted with US Players.
Most of us are scrambling to adapt to the present market conditions and to boost our non us traffic. That takes money and cash flow so we can afford to have our pages translated and our domains and links adjusted towards new markets. I hope the programs keep that in mind as well.