I'm skeptical at best, but I guess we won't know for sure until they start using it. With all the restrictions on the use of the wing, I'm worried that it will screw up what would otherwise be good battles. I hope it doesn't create situations where a driver passes someone he is fighting with, only to be repassed by that same driver the next lap, etc, etc.
To some extent the wing will have the effect of making a straight longer. In a lot of cases if the straight was a bit longer more passes would happen, since if you can just get close enough to get a tow the possibility is there.