Catch that Teemo!

Baron's not very hard as a team if you don't rush it and don't have your squishies die.

You'd have to have a more specialized team to even attempt early Barons now.

A single successful Baron attempt/kill can completely change the course of the game. If people are competent, they won't give you the chance. And when you see even the smallest of windows for a clean Baron kill, it's incredibly important that you can do it fast and on the fly instead of waiting for everyone to set up for it.