Yes, you are 100% correct (so far as I know) that Martin did not at any point state "I promise that, no matter what, I will complete this series. All books will be out in a timely manner."

I think you would be hard-pressed to argue, though, that writing three books in a series is not an implied promise to write the whole series. I don't think I've ever heard of an author who wrote two books in a series with no intention of ever completing the storyline. Or leaving all of the main story threads unresolved, and then leaning back and saying "Alright, now it's time for my ten-year hiatus, just as planned."

Don't get me wrong, I don't really give a crap about the legal debate from up above. I just feel like some Martin defenders like to trot out the "he never promised anybody anything" without seeming to understand why that argument is wholly unsatisfactory.