Diving in deeper, we can see that most of the Jelly Bean users are still on the older version 4.1 at 37.3%, with 14.8% having moved up to 4.2 or higher.
Even with adoption to Jelly Bean starting to reach a significant number and upgrades to 4.2 on the rise, it all just seems to-little-to-late with Google's new Android OS already starting to reach the public. Android 4.4 Kit Kat is designed to support as many devices as possible, so its likely Jelly Bean won't remain at the top of the list for very long.