Authors have been missing deadlines pretty much as long as they've been writing books. If you wish to have an expectation that author X or book Y isn't going to

Authors have been missing deadlines pretty much as long as they've been writing books. If you wish to have an expectation that author X or book Y isn't going to fit that pattern then feel free, but I'm not sure you should be terribly surprised or outraged if / when it doesn't happen. The simple solution would seem to be that if you are someone who likes reading things in a nice predictable pattern the wait for the series to complete before starting. After all, it's not as if there are a lack of things to read in the meantime.