Of course he's not. That said, delivering Book 1, Book 2, etc creates a social contract with your readers that you're actually going to finish the damn thing at some point. If you can't handle expectation, don't write open ended series. If you don't know where the hell you're going when you start, you end up putting your readership through torturous wandering plots and interminable waits.
He's not my B**ch, sure, but nor am I his. I'm not starting a letter-writing campaign or some such nonsense, but nor can I be expected to be gracious about the whole thing.