How do I permanently disable Notification Center in Mavericks?

In Mountain Lion I was able to permanently disable Notification Center, with no apparent side effects:

launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist
killall NotificationCenter

However, the Mavericks upgrade process restored Notification Center in all its irritating glory. Is there are reason that the upgrade reverted my disabling of Notification Center?

Can I disable Notification Center in Mavericks using the same procedure, without side effects?

Solution 1:

If you start Terminal, enter

sudo defaults write /System/Library/LaunchAgents/com.apple.notificationcenterui KeepAlive -bool False

and restart, this did the trick for me in Mavericks.

Solution 2:

Just unloading the plist still works for me:

launchctl unload -w /System/Library/LaunchAgents/com.apple.notificationcenterui.plist

If the plist is not loaded, sudo defaults write /System/Library/LaunchAgents/com.apple.notificationcenterui KeepAlive -bool False should have no effect.