I think the removal of Summon Selene is a good idea of what they have planned for SCH in 7.0. 1-2 new buttons and the rest will be upgrades via traits, just like in Endwalker. Otherwise I cannot figure out why they would've bothered removing Selene's button mid expac and adding faerie glamour when they could've waited until DT and touted it as a new feature for SCH that was part of the rework. (Or you're right and this was a rework feature that got pushed live ahead of the rework like one of the DRG changes?)
I remember going into Endwalker Yoshi-P gave an interview saying that removing buttons each expansion from healers was incredibly hard compared to the Tanks or DPS jobs because of how many of the healing buttons are situational, and that they weren't really sure which ones they could remove without "causing issues." We can all probably point to things like Cure I, Physick, etc but it seems very much like an issue they just don't want to tackle and keep shoving off until they plan to do total overhauls to the game, and based on his statements about how they're going to look at jobs after level 100, I think its somewhat safe to say that this is just Scholar for the next few years.
I expect AST to still have things like Synastry and Enhanced Benefic come 7.0 because they've survived this long and SE is deathly frightened over the idea that 10+ year old min ilvl coils might not be possible or something
As an aside I wouldn't be surprised if they removed Aetherflow as a button and made Energy Drain function like SMN's Energy Drain as a way to consolidate buttons and remove skill ceiling from SCH's kit. Gets rid of Yoshida not liking SCHs using Aetherflow for damage over healing too while keeping the 'core' of using it on CD for MP and stacks. Damage buttons are always what they look at first with healers when they want to get rid of something lmao