I loved the first two seasons of The Crown, and I enjoyed season 3, but I really didn't like season 4 - i think because that's now in my memory, and I remember sitting and thinking "that's not what happened..." I suspect that a lot of people won't like seasons 5 and 6 for the exact same reason - it's too close to recent memory.
You either have to be completely factual, or complete fiction - you can't dip in and out of both.
I always thought that it should end with Diana's death - then the post-Crown follow on would logically be The Queen, with Helen Mirren (also done by Peter Morgan).
The stuff in the papers today suggesting that they are recreating Diana's crash seems hideously insensitive. There's literally no need to try and recreate a crash where three people died.
Does anyone know what season 5 will cover? I assume the divorce, panorama, Windsor Castle fire... I also wonder if they will highlight the deception that Bashir used to get Diana to be interviewed now that it's a record of public fact