I feel like they’re safe at Disneyland. Any classic attraction that made it past the 50th is likely here to stay. If the CBJ had held out just a few more years I fully believe it’d still be here today, and Pooh would’ve been put somewhere else.
MK’s only “safe” attractions imo are Space Mountain and the Country Bears, since they’re both MK originals that prove to still be popular and/or beloved. The bears might technically be a new show, but overlays and changes aren’t new to them. The OG show hasn’t been in MK since 2012 (and if we’re getting really technical, the OG show hasn’t been around since 1975). Our Space Mountain is the largest and the original, and with TRON being next door I don’t see them doing a new version like Tokyo.
MK’s Haunted Mansion and Jungle Cruise might also be safe since they’re both consistently popular and both got recent additions.