Yes ofc its all speculation. We dont know how it will turn out in the end, but just looking at the cross-skills for WHM now makes me cringe.
You can simply do the maths:
You have 5 slots.
WHM loses 5 skills that were basic: Protect, Shroud of Saints, Esuna, Divine Seal and Cleric Stance.
Cleric Stance is no longer "mandatory", makes 4 skills -> 4 skills alone fill the cross-skill slots to simply be the WHM again you were in 3.0. Nothing lost, nothing gained.
Something also mandatory for heals is ofc Swiftcast to quick-raise = all 5 slots are filled.
= You dont have any space for Eye4Eye (which I now have as WHM), no Virus anymore and you are not able to chose any of the new skills like Rescue or utilize the Cleric Stance buff. So if the new job skills for WHM arent something really game-changing, WHM will automatically lose more in Storm Blood then gain. And if thats the case I will sadly change main after playing WHM for 4 years - and, thats just sad.