It could go this way. I'm inclined to say no big companies will move away from Active Directory or Office prominence and dependency anytime soon, because today no alternative exists that really ticks all the boxes. BUT, in the future, who knows? Something may just appear that's much lighter / more intelligent and cheaper than how MS does it. I wouldn't bank on it, but it's certainly possibleI think you agree with me. I was careful to use Microsoft and Windows and Office in the appropriate places.
Microsoft is the reptiles, and won't go away. Windows and Office are the dinosaurs, which, I think, are approaching end-of-life. Microsoft will change and adapt while Windows and Office have evolved into a digital dead-end. They are too big, and no longer agile enough, for long-term survival.