I agree with the others, the signs need to be usable by more than just the party leader. Preferably everyone, but at the very least the leader should be able to delegate sign users. In any scenario where your party has to split up its going to be necessary. On top of that, if the inability for the unconscious player to do anything stands, then no mobs are getting marked while the leader is taking a dirt nap.

And what about Ally signs? Will everyone still be able to use signs to mark themselves? I can't tell you how many times I used the "I'm out of MP" sign to gently indicate to my bards that Ballad needs renewed (or was thankful when someone else did when I was on bard.)