For those of us who applied in the first few days and got accepted, if we don't get the full 100k miles then there is a lot that we can do to apply pressure - including BBB, state consumer protection, etc.
But if it comes to it then yes, I think that deceptive marketing is one of several possible avenues that we may have for recourse.
HOWEVER, lets wait and see whether or not we really do get our 100k miles before jumping to conclusions.