That's the point of removing potency from Blunt Arrow, so we don't need to weave it in our usual rotation anymore lowering the amount of overal OGCD's used.
You'd still use it in occasions like back in the day T1, T2, T9, Chimera etc, but it would be just like the MCH utility skills with no potency or like BLM Lethargy just a utility skill.
I do however see the use of a little damage on OGCD skills so you could also add the potency of Repelling Shot on top of Blunt Arrow, since Blunt Arrow is the one that flows better.
I am not sure if I understand your Elusive Jump point still.
Dragoons do not come with cast times.
The new use of Repelling would be to be able to finish casts then jump out of the spot on the same cooldown as the BLM Aether Manipulation skill.
It would still be limited in its use since it still pushes you away from the target rather than wherever you want to go.
As for WP, I just don't know what to do with it, there are many ways to make it useful.
It does not look like SE is planning to put a strong skill in that spot and it does seem they want it to be a utility song so I guess something with that in mind.
Which makes the ideas of party wide strong buffs something not likely to happen.