Well, I was able to reach 16k ds on just shield users with the elite bow. I do think if you use the right cards and gears you can reach higher damage than the amounts you stated (kobold archer cap for example, so you switch between double kiel and single kiel or fsoldier or w/e you put in kobold). Still at the rate DS can be spammed + from a far range it should be a tad weaker than the shortrange skills and at the moment I think the damage is more than fine.
This would fix the baby character problems yes. But still in my opinion certain classes are supposed to be good at breaking, and certain classes are supposed to be better at other tasks. So in my opinion I don't think this should be in (just my opinion though).