I'm looking forward in some ways to when SAO goes full Terminator. Will Kirito be the John Connor here or more the guy that has to be stopped because he helps lead events towards the machine uprising? Oh sure the adventure in Space Underworld will be fun and all. But far more interesting is the apocalypse brewing with AI Kirito looking for AI Kayaba. Can't wait to see how that works out
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No doubt there is plenty to keep an eye on going forward. SAO isn't going to be running out of possibilities any time soon. And always plenty of spinoff options to keep them entertained until they can keep the main story rolling.