Honestly I don't think it's going to be enough to link mana to draw because we also lose the 1/2 mana cost of lightspeed.

On top of lucid,
WHM has assize, thin air
SCH has aetherflow, energy drain and can dissipate to do more energy drains
AST will have draw

The issue here was that the other healers have two ways of regaining mana and I fear they've missed the point entirely again if they do that.

By removing the time extend on celestial opposition they really nerfed AST's ability to extend lucid and regain enough mana reliably. Just changing the source of mana won't stop the fact that we'll still be worse off than the other two in terms of mana recovery. Probably more than now, but still less.

Or they'll give us too much mana per draw and the other two healers will complain that they're buffing the already top performing healer and it'll be stormblood sch/ast meta all over again.

If we kept lightspeed's mana reduction and gained a second source we would be on par, but we're losing that. We would have more mana overall, but no where near as much as the others.

I'm curious to see what they're going to do.