Frankly, I love ambiguous endings that demand from the reader/viewer more than just observation, absorption, and playing the witness to story.
People around me get eaten up about Inception (movie), arguing that the ending is This or That...
...no, it's deliberately an ambiguous ending. The fact that you're TRYING to resolve it defeats the purpose. Asking the writer to resolve it for you just misses the point of it.
I don't consider it a cheap shot... I consider it a nod to the reader, a way to say, "Hey, you've stuck around with me this whole time... why don't YOU imagine it how you want, instead of me ruining your image by giving you an inarguable, permanent final mental image? You can write the ending in your own mind, and I don't have to destroy that for you. It's your story, now."
By leaving it open-ended, the author gives us complete free reign to believe what we want about the results of ramming the Blade Ship... and for that, I'm grateful to the author. No epilogue can match that. :]