[Siggrodoth]

Spoiler for Meet the Suzumiyas:

Frankly I was hoping for a distant finale, but this will do.
Other elements that could factor into your sequel aside from John McBrainParasite there: Kyon still hasn't used the trump card, and the anti-SOS Brigade never even made a cameo. Maybe with the imminent publishing of the tenth novel you could weave them into the narrative for that hypothetical story.
I didn't feel the ending was as epic as it could've been - well, more precisely, the epilogue - but mostly everything wraps up nice and neat. That's more than we fanfic readers get from most stories that start OK but end up unfinished.

...
I still want a distant finale.