My suggestion to all concerned (myself included) is to let things take their course, and not be hasty.
We are due 50k at first statement and 50k when we hit the spend threshold. I doubt that anybody has hit the first statement yet, so we have a while to wait until we see whether they are screwing us or not.
If we lose out on either count, that is the time to start making a big noise - and doing it in a concerted way. There must be hundreds if not thousands of FTers who applied for this "best CC offer ever"; let's use those numbers if and when it comes to it.
I remember the cheese wheeel fiasco - and how we got a somewhat acceptable resolution in the end (though I was not in for a lot of miles on that one) by making a lot of noise.
Writing to NYT, WSJ, etc travel and personal finance columns, and applying pressure from the BA end as well as Chase are all good possibilities to create negative publicity - the objective would be to make Chasen & BA believe that they risk costing themselves more in negative publicity than they save by welching on their offer. I'm a JPM stockholder, and I wonder if others are - and that may be another route to take - lots of mail to investor relations may get the issue noticed inside JPM outside of whatever marketing group handles affinity card offers. Same thing for BA stockholders - not sure how many on this side of the pond own BA stock for the stockholder discount, but a letter costs only a few cents. Often IR has a short path up to the CFO, and even just a couple of dozen letters on the same issue can get attention much higher up than through usual CS channels.