I think they should try and build a setlist running order with more of a strong/distinct rollercoaster of drama and mood than 360 has. That is where ZooTV should be used as a blueprint - 'the ride' through it's very distinct phases is as equally important to everyones love of that tour as the songs and 'show'. There is a real drama to the flow of it, well beyond the characters and whatnot. So less about a balanced running order - which is what they seemingly focus on these days - more about drama. It would be impossible, for a number of reasons, to do it anywhere near as well as ZooTV, but if they build even a Greatest Hits setlist the right way, with all the right theatrical extras only as enhancement, they can make it something much more than just a 'Greatest Hits Set'. The latter would still be unbelievable beyond words, but the former would tip it over into something people talk about for a long, long time. An unassailable, all-time, singular Glastonbury highlight.
And not so much a leaning on this decade or that decade, but more a good showing off of diversity. The reason you want them to go heavy on the 90s is to snap people away from a belief that they are just 80s/00s chimey stadium anthems and poppy singles, but there's more to each decade than that anyway. Not all of the 90s stuff is wild and nutty rock, not all of the 80s is chimey stadium anthems. Better than a run of Achtung songs to open as a perception changer, would be giving a full range - from acoustic sweet Stay, heavy-as-fuck Bullet the Blue Sky, bold brassy Angel of Harlem, mad as hell Mofo (and on and on and on.)
They'll never do any of that, but IMO, that's how to really really kill it.