Right now the problem is that (while DRG isn't necessarily that underpowered anymore) the whole LoTD mechanic doesn't feel rewarding at all. And eyes still fall off when not in BoTD. So i'm in for anything that makes DRG's mechanic more rewarding.
Right now it doesn't interact with our skills much and just replaces Geirskogul with a stronger version of Geirskogul which we can use 3x. And that's all we get for a 1:30-2 min buildup. Long buildup for low reward.

Dragoon needs to be able to use LoTD a bit more regulary & give it a bit more burst. (even if it means base DRG skills need a nerf for balance reasons.)

I doubt SE will make any major changes to the classes mid expansion. I think some easy changes would be.
-BoTD triggers Mirage Dive when already under the effect of BoTD.
-Losing BoTD doesn't make you lose eyes.
-Buff Nastrond potency to 400

Another interesting change would be that LoTD doubles the bonus potency of Lance Mastery.
Or maybe something like what you said.
While in LoTD your 5th comb finisher (Fang & Claw or Wheeling Thrust) changes into Ala Morn (500 potency?)
Gives us something else to use Life Surge on. hehe

And maybe nerf some base DRG skill potencies to compensate for the buffs if necessary to keep everything balanced.