Of course, all my rambling is mostly what I assume is the logical path.![]()
But seeing how they made SCH pet abilities instead of spells (thus making them less clunky and more reactive), addressed clipping on AST (thus making oGCD use easier), added more and more oGCD since Heavensward and no new GCD spells (just upgrades of the older ones) : I assume they are going that way for 5.0
Now the buffing component is another discussion, but based on the same assumptions we now have more ways to use them without clipping, they are highly valued in endgame content, they work well in synergies... I'd also assume it's a logical progression to go on that way.
That does not mean WHM has to become a buffer, but it definitely needs to see its clunkiness addressed. It could still rely on GCD, but they would need to add a tweak so that GCD use is more valuable for the job than oGCDs.