Yes you did. You said it would be a Harsh change to have you Complete a Dungeon.
The Problem people leaving Groups after Certain Bosses is always there, now its just more Noticable.
Later in the Expansion it would be even worse, while not as often. Because there are less people who queue up. And those who "Fill in" the dungeon get a shorter stick aswell.
The Solution only affects people who dont intend to finish the Dungeon in the First place. And again, with the mere existance of the Dungeon Deserter, its intended behaviour to finish dungeons. So, its a non Issue for everyone who plays by the Rules.