Maybe so, but regardless I still think it'll be a nice addition to the timeline.
By the year 10,000 A.D, all computer time and software with a 4 digit encoding will be incapable of processing and keeping track of this date, which may lead to some complications trying to store and retrive data beyond this point. This should also be added to the timeline. Source here and here.
I don't think there will be any windows users by 10.000 AD. Or atleast those who remember what "windows" means...
Yes, as an obvious joke but one that is appreciated.
No, I really think this should be on the timeline
No computers in existence today will be around in 8000 years.
And no human alive today will be around millions, billions or even trillions of years from now (unless you're immortal). But yet they're predictions on the timeline that are that ahead, such as the sun destroying all the inner planets including Earth. We won't be around 5 billion years from now to see that but the prediction is still on there. Same goes for this prediction. You're right that no computer today will still be in use over 7 thousand years from now, but so what?