I've been posting a lot about this potential change, since Senior PvP Designer Brian Holinka tweeted about it a while back when changes went in by accident after BlizzCon. And while I am still not a fan of the change, I can agree with it way more in 2v2 than in 3v3 or 5v5.
Why is that? Well, in 2v2, especially in healer-DPS versus healer-DPS, matches can go on longer, and even result in draws far more often than in the other sizes. Simply, a healer is not designed to be easily killable by a single DPS. As a result, it's harder work to take them down in 2v2. I won't pretend that I like the Dampening system, but it's better at 5 minutes in 2v2 for (hopefully) just one season.
What we don't know yet is just how far it will go.