It's weird to realise this isn't it?
My kids (20's) barely know anything about her and really don't care.
She was so iconic for us over 50's it's hard to appreciate this.
And it's not like old bands, or music, or films which can get cool cult status with a younger generation: there are no Princess Di T shirts or posters on the walls of uni kids.
She has no ongoing cultural influence. I think the last of that was Harry's wedding when those of us who remembered her thought 'Diana's boy is getting married' Beyond that no one cares anymore.
She's just the dead mother of Prince William. The interest is going to be in Williams kids as they become adults, not in his mother.