Chart's currently looking like this. If we don't have a majority, we can do what sometimes happens in politics, and prune away the extremes, Total and No just cancel each other out, they're equal. That leaves us with Major, and Mini. But neither are the 'midpoint' on this because there were only 4 options, there's no 'center ground'. So while Mini is larger than Major, it'd have to swing towards the Major side of Mini, because there was 2 groups on the Major side and one on the No side. At least, that's how I see it. If you just go Mini rework, they're happy they got what they wanted. But the No's didn't (it's too much change for them), and the Major's and Total's didn't (it's not enough). And since Major+Total adds up to more than 'No', the rework should, theoretically, lean more towards Major.
If we assume Mini (as I have been working off of so far) means 'akin to when they made NIN mudra's GCD', or 'when they just removed GL from MNK in 5.4', then I'd assume that a 'Mini rework to WHM' would look something like what I suggested, but without the Shielding Lily spenders. So Banish as a 15s GCD, new damage neutral heal tool that is charged by doing damage, and rescaling Dia to be much shorter duration (so it feels more bursty). If they wanted to move it into 'Mini, leaning towards Major', they could add one extra thing for the damage side that doesn't take too much thought, like Cleric Stance as a 10% damage selfbuff for 10s, 1min CD. Upending the whole Pure/Barrier split with the Shielding Lilies would be at least 'Major rework' grounds, so I would cut that part. Rescale Dia to 12s duration, Banish as a 15s GCD, a new gauge that charges from doing damage (and maybe healing, but at a lower rate) a new heal spell that is damage neutral, Cleric as the 1min window selfbuff (like Trick) and your Protect>PI idea. A damage skill, a slightly retuned damage skill, more healing, a new mit, and a new CD to do damage with in the 1min windows, that'd be pretty close to what I'd hope for from a 'Mini, leaning Major' rework.