As we all know by now, 4.0 is going to see some 'changes' to the battle system.
During the 3.0 series Scholar has been widely considered to be somewhat more powerful in PvE compared to the other two healers (though this gap is much less between SCH/AST because of Balance).
I'm predicting two changes that I can see happening in 4.0 to tone Scholar down a bit. While it's most likely that we'll just see potency boosts/drops (like with every other 'major job change'), these are my crazy ideas on what could happen so it can remain equal to its co-healers.
#1: Fairy will not longer automatically cast embrace
I know even before posting that I'm going to get absolutely shat on for suggesting this. But personally I feel like the fairy's auto-Embrace makes it too easy for the Scholar to simply sit back and do nothing. In most content the Fairy is able to take on a large amount of the Scholar's healing responsibilities, and buff the party with Haste (albeit a weak one), and use powerful AoE Regens, and offers great utility that no healer is able to do (AoE Magic Defense Increase, AoE HP Restoration increase, AoE Esuna). When you consider it like this, personally I think the main reason that Scholar is overtuned is the Fairy being maybe a little too powerful, especially for a pet that's supposed to be supplementary to your healing, not your main source of healing. I understand that many people will say, "but other healers have Regens that do the same thing!". And this is true - to an extent. But, Astrologian and White Mage have to use time and resources on their Regens, which is the fundamental difference that makes the Fairy so much more powerful. Not to mention that Regens from Astrologians and White Mages can't create new Regens, nor Esuna the party, nor raise the party's healing/defense, nor buff the party's dps.
#2: Deployment Tactics will no longer spread the effects of Critical Adloquium to party members (instead spreading only the pre-crit effects)
This is another one that's going to make people foam at the mouth with rage, but honestly I think it's likely that they'll do something to this ability. Personally I don't believe any healer should have the power to make certain mechanics easier to deal with that wouldn't have been had the party setup been AST/WHM, and making it so the double-shield from Critical Adloquium doesn't spread would mean this ability doesn't need to be drastically changed to be make a bit less powerful.
3# Scholar MP Management
It's well-known that Scholars (when managing their MP properly) have almost infinite MP. As a Scholar I honestly can't think of any times where I've had to make a conscious effort to conserve my MP or risk running out. This somewhat applies to other healers as well, but Scholar requires almost no management of their MP because any Scholar worth their salt will be using most of their Aetherflow on Energy Drain for the dps boost. I think - for all three healers - in 4.0 we're going to see more focus on managing MP, if only because it's almost redundant in current content where there's little if any need to actually manage resources.
4#: Ease of DPS
It really doesn't bode well for me when I have to start every point by stating that I'm aware that this change would cause extreme backlash from most Scholars, but nevertheless...
Scholar is a bizzare case in FFXIV, in that it's a healer that's also technically a DPS. As mentioned in point #1, Scholars have much more freedom to dps than their co-healers because they have a Fairy that can shoulder their healing responsibilities. And with such a large portion of their abilities being dps-focused, it's clear to most that Scholars are ideal for contributing personal dps.
This isn't a problem itself, of course; there's nothing inherently wrong with a hybrid job. The problem is that this hybrid job has to compete with other healers that don't have the priviledge of being part-DPS. As such, Scholar is able to dps much more freely than it's co-healers, often without having to bother with healing requirements, MP Management, or other means of bottlenecking their dps such as party buffs (like Astrologian cards, which can cut into the GCD).
I think in future we'll see Scholar's ability to DPS moved to be more in line with that of Astrologian / White Mage. This doesn't mean that any of their DPS abilities needs to changed or nerfed, but simply that they should have the same bottlenecks as other healers (whether it be healing requirements, having to buff the party with GCD stuff, having to manually control the Fairy in times of heavy damage, etc).
Obvious Disclaimer: All these predictions are based solely on my own opinion and reflects only my own thoughts on Scholar. They do not reflect the opinions of the community or Scholars in general. Naturally, the developers will choose to take Scholar in the direction that the community wants it to go in, which seems to be an even heavier focus on DPS for Scholars than currently (in my opinion). again, this doesn't reflect what the community actually wants, it's just how I've interpreted what I've been reading the past few months.