And it wouldn't really change anything...
Let's say you have a PLD that can apply the blunt debuff. MNK will probably still do DK to apply the INT debuff.
Let's say you have a DRK that can apply delirium. MNK will probably still do DK to apply the blunt debuff.
Let's say you have a DRK and PLD that can apply blunt debuff and delirium. Well, you don't have a WAR, so you're doing less overall DPS.

And it still wouldn't increase PLD's damage...except for Shield Swipe, that you don't want to use because it's a DPS loss, but that you'd use now, because, with the blunt debuff, it could be a DPS gain...
You can just increase Shield Swipe's potency for the same final result