I think the generation that grew up watching a lot more long form television than older gens, and whose movie industry landscape is a sprawling interconnected seemingly endless series of multiverse films with impenetrable lore, will be fine with the idea of songs. Though it’d help if the biggest and most culturally lauded slots were aimed at them, rather than their weeping parents
Personally what I’d do is shift a lot of the ‘second tier’ modern acts up to headliners, giving them the chance to actually become headliners, like used to happen (the Elton’s of this world were headlining things when they only had half the back catalogues). Stop giving so many slots to legends, (a couple really big hitters a year - the rest can go in their own geriatric tent, with oxygen and white wine on tap) and make sure that people who only check in with the zeitgeist once a year at Glasto get a chance to actually see some modern culture and bond with their kids on their terms rather than ours. Like Stormzy a few years back, for example.
Though with disposable income becoming so generationally skewed, I’m sure it’ll become more and more profitable to keep aiming £300+ event weekenders at older and older markets.. which is its own separate problem