The current tour shows that their ideas for Hits/History tours are running out, but there should be a reason why the 50th anniv tour is only for the first half of their albums...?
I think that the three most recent tours (LOTB-Future Past-RFYL) showcase that they actually
aren't running out of ideas of how to brand tours that, essentially, cover a certain classic period, whether as a main focus of the show or just partially.
That being said, I get what you mean; there probably won't be another as straightforward greatest hits kind of a tour of this scale.
I still think that the reason behind the 1980-92 album focus is purely pragmatic: there is no way to give a proper representation to every single era, play all the essential hits & include a couple of classic epics & gems in the vein of Rime & Powerslave.
I mean... yeah, they sure could play Bring Your Daughter, Futureal, The Wicker Man, Dance of Death/Blood Brothers and, e.g The Reincarnation of Benjamin Breeg and hence cover the whole history of the band in a more fair manner.
However, as much as I'd love to hear any of those songs, there is no way that any of the biggest 80's hits would've been dropped from this kind of a tour, so eventually the most (arguably) interesting songs of the current set would have been left out, at least I believe so.
I'm a huge fan of their 'reunion era' output, but I can totally see the appeal (both, from the band's & marketing perspective) of revisiting Rime of the Ancient Mariner, The Clairvoyant & Seventh Son of a Seventh Son after some 11-16 years instead of a handful of more recent songs that, to be fair, have received relatively alright setlist representation in the past 10 years or so.