What is the point of syncing with iTunes if I have Google Apps, iCloud and no media? On my iPhone and iPad I use Google Apps for syncing mail, calendar and contacts. 
With iOS 5 I now use iCloud for backup (and for syncing Reminders, Bookmarks and Find my iPhone, none of which I really use).
I have no media (music, video or photos) that needs to be synced with the iPhone.

Out of habit, I still sync with iTunes (over Wi-Fi now), but I am starting to question why.
In my setup, is there any reason to sync? Backup seems to happen anyway, and Google Apps sync independently and immediately anyway.
I sync apps in iTunes, but I fail to see the point of it, since I can now download any app I am missing right on the iPhone.

Is there any reason to keep syncing with iTunes? Are there any bad consequences of completely giving it up?

The one thing I can think of is iOS updates. Will I still need iTunes for those?
OS updates will now happen over the air. The only reasons would be to sync a new iPhoto event/album or to sync content that you added manually (ripped CD). 

But outside of that, iOS doesn't require syncing.