I was kind of a believer in the committee model, but I've evolved into a skeptic. In part this is because it seems to fail much more often than it works. I recognize that in most cases, teams chose to go with a committee at least partly because they didn't really have a lights out closer, or at least they didn't think/know they did. Maybe the committees failed because their members weren't that good. But it's been tried enough times that one would think the might be a success story somewhere,
Another reason I'm a skeptic is that if you have a committee, you need to have more than one reliable reliever. Even if yo use your best guy in a high leverage situation earlier in the game (like the Indians do), they still have a reliable closer. If the Phillies used Andrew Miller to get out of tough situations early in the game, they still could have problems if Gomez was the guy in the 9th.
It also seems to me that while the best closers aren't always on good teams, the winning teams usually (but not always) have that lights out closer.
I would like to see managers not manage to the save rule, and also to let good pitchers go more than one inning at least some of the time.