Trying to write hard science fiction for this setting is not remotely possible for any human equivalent mind.
Your options:
Not to discourage you by any means. Especial that third option is very flexible and can be done subtly. Just writing what you originally intended and putting a disclaimer in the foreword will do, but having it in mind will save you a lot of headaches over unnecessary realism that is just a pipedream anyway. (Note that this is not a free ticket to cut corners on DETAIL or CONSISTENCY)
(Then again, I have zero writing experience so you probably shouldn't take what I say to seriously.)
Trying to write hard science fiction for this setting is not remotely possible for any human equivalent mind.
Ghost in the Shell does it pretty well, IMO. Well enough to suspend disbelief, at least.
So, the usual bet is that the GAI, both F and UF will be created at around that time at the latest. I'd like to set a novel, a thriller, right at that critical moment where everything could be lost or won, and humanity is in the balance. But human societies and the way they interact with each other will have changed a lot by then. So, well, I haven't read throughly enough here to understand how far we are anticipating what will happen. Not just the friendliness of AI development, but our own impact in the world, and how it will react when it finds out about us and our goals, and takes them seriously.
So I was wondering if you'd help me out here with some brainstorming. I'm looking for some seminal ideas for how the world will look like by then. We don't need to be 100% precise, although keeping the pieces of the setting vague by avoiding Burdensome Details is a way of avoiding glaring mistakes, and gives a Lord Of The Rings, Ruins In The Distance feel of false depth. Don't hesitate to suggest seemingly weird but actually reasonable ideas: the future I want to build is a Weirdtopia. The point is to frighten, wonder, and suck the reader in.
Let's see, for a start: cryogenics and cybernetics are a solved problem, and people's heads are being resurrected and put on mechanical bodies by default (they could ask for recreated biological bodies, but usually after the first tantrums... they don't ^_^). The audience can be given someone to identify with through a Temporal Fish Out Of Water, one of the resurrected Human Popsicles. The funny part is that, even though that person happens to be a transhumanist AND a singularitarian, they hadn't surpassed the Shock Level (I think that's what Yudkowsky called it when you were enthused with an idea because you don't think of it as normal yet?), and they are only marginally less freaked out by the world they find themselves into than the normal sci-fi fan readers (or even the mainstream ones, if this ends up so good as to have any).