Btw, what are you thought on Sinon and the dude from the council who wants to get rid of her? Maybe Sinon can outmanipulate all the dudes, turn them into girls and have her own harem from streams
If there is no ending where Kirito ends up Sinon and Suguha's toy, then Sinon is probably going to fail in whatever her goals are and end up the town bike (in FOG) is my guess as to where she's going. If there is an ending where Sinon and Suguha are with Kirito, then it's definitely because Sinon was able to out manipulate all the dudes. Sinon's future is up in the air because while she's suddenly become a lot more competent and aggressive compared to before, she hasn't really cemented herself in a place where she feels "safe".
Like Suguha compared to Sinon feels "safe". Suguha taking advantage of her body to get what she wants and not succumbing to typical NTR big dick is kind of the most OP ability a female can have in an NTR storyline. I don't know if Sinon is capable of resisting sex considering the main reason she's free from Hebishima's clutches has more to do with Hebishima getting bored with her, versus anything of her own free will. I doubt Fujino would delve psychologically how someone abused like that would end up becoming a dominatrix/femdom to regain a sense of power after being the submissive one to Hebishima this entire time. So there's no real deep character development to expect here.
A lot of Sinon's future is dependant on the "main plot line". What are the overall goals of the secret council and the administrator? Also what is Sinon's supposed wish since it sounds like the Administrator will grant something (I think this was mentioned somewhere).
As a side note, with the very little dialogue that the guy said in regards to an outside party, I would assume that Sinon has more resources (from her side of the secret council) and reflexes (they mention how she's a pro GOG player) to out manipulate and out maneuver her adversaries. I initially thought the guy was going to call up Hebishima to help him take down Sinon, but then that was thrown out the window when we saw what actually happened to him. XD
Another prediction I guess is that Sinon is probably the most active to bringing the administrator out, so maybe the administrator will just favor her completely to take down the other secret council member. It's not like she cared about Hebishima, and based off the interactions in the recollection room, it does seem like the administrator wants Sinon to corrupt Kirito. So having favor from the deus ex machina character gotta has some points in her favor I guess?
I do hope her interactions with Kirito does escalate to intercourse at some point.