Well, my opinion is that no Worldcon committee has the right to do things that damage another Worldcon committee. And deciding that if you won a Worldcon bid, you have the right to hold a Worldcon anytime you like, even if you delay it for years and scramble up all of the downstream Worldcons. At the absolute minimum, if you bid for a Worldcon for year N, you have to hold it during year N. Not N-1, not N+1 and not sometime "when we get around to it." Surely you don't think CoNZealand could have just said, "Well, we won't hold the our convention in 2020. We'll just wait and hold it a few years later," do you?