Agreed, Diana is old news. For most people under 40, and probably many over, her story holds little relevance now. I’d go as far as saying Charles and Camilla have little gossip value too. With the huge PR attacks on Catherine and her family from Team Sussex, it feels like any big potential drama around the Wales family has already been had and done. Especially as she had to battle cancer - I think we’re desensitised to all of the conjured up PR drama now.
AMW was probably the last big PR bomb, when he lost his titles. Most people seem happy with Charles, William and George, and there isn’t much appetite for a republic. We really do have much, much bigger fish to fry as a country and in the Western world.
The world has changed so much in the last 30 years that a book about Diana is really only good for one thing: Spencer’s pocket money. I do think Harry and Meghan have good rage-bait/click value. Not nice, but I suppose they fulfil the traditional role of the black sheep of the family / country. (Though, since we don’t actually deal with sheep much anymore, perhaps even that expression is a bit dated!)
There was even the Dutch lorry book robbery, version 2. It all just seems so tired now. Diana is in the past, she should be let to RIP. We have other, much more pressing problems to deal with as a society. It's very strange to be conjuring up the Diana Ghost. Very self indulgent of Charles Spencer, he should, as the saying goes, check his privilege.