And just after I accumulated 50k Amtrak points!

I spoke with a rep just now, and he says that as of this morning they were notified by Choice that they no longer want to do the exchange, and no further exchanges will be processed.

The rep also told me the rate had gone down recently from 5k Amtrak gets 25k Choice to 5k Amtrak to 15k Choice; but now, it is gone...