Even though everything seems to be going great for Suguha right now, there are several potential threats that could come into play later—especially if Fujino decides to take the story in a darker or more tragic direction.
Suguha working for Sinon is already a risk. Sinon might end up using her as a tool, then “disposing” of her or setting her up if she becomes inconvenient.
The influence of the Shadow Fox—the fact that he’s now increasing pressure on Sinon means that if he finds out about Suguha as her ally or helper, he could try to use her as leverage. Manipulation, mind control, or even direct violence are very real possibilities.
Suguha’s new power is another flag that could lead to her downfall. It might be unstable or come with serious side effects. It’s possible that Suguha doesn’t even fully understand what she’s paying in return—be it her health, memories, emotions, or even control over her own body.
So while it may look like Suguha has everything "under control" right now, in a world ruled by forces like these, that kind of stability is almost always an illusion. Especially when "NTR gyarous", "Councils", and the dark underbelly of the AV industry start getting involved