The ideas were bigger than 'look at what is new' - but the presentation was always flawed in that they told a story that always had a leap-off point of the present. They laid out narratives that were based on perspectives at the time. I'd argue they are worse off than a Tomorrowland (sans the original DL TL) because TL has been more about sci-fi and extreme future(or might even call it fantasy). The majority of the FW attractions had this common story telling element of review, show how it shaped the present as you know it, inspire, and try to set you off with optimism about what the future can be.
But for many...
WoM, UoE, SSE, Seas, Land, Communicore - this all meant a leap point or climax with 'the present'. Much like the problem with CoP. All of those beyond the Seas (because it was so forward looking) struggled in that their narratives were not current with evolving thoughts on the subject matter either.
FutureWorld while it wasn't just about 'look shiny tech' - It was doomed by the accelerating society around it that was moving faster and faster because of 'shiny tech'. It's references, tone, and presentation dated extremely fast because the subject matter was about the present and near future... and those two things raced forward at paces unseen in the decades prior.
I'd say most of FW was already stale by 1992. Only the attractions that didn't focus on the 'now' as much.. like Seas, Horizons, Imagination were more immune.. yet even they had needs for refresh as just show technology advanced.