I think a lot of this has to do with what jailbreak tweaks you use and rely on. I dropped my JB and am on iOS 7 (since the GM release last week). I had to lose my jailbreak to get my iPhone 5 replaced before the warranty was up, but even so, I haven't missed the jailbreak since installing iOS 7 (though the 3 days after the phone swap before the GM release, when I was on stock 6.1.4 were ROUGH).
To those who say there aren't any new features, I question what iOS you're looking at. This is not a cosmetic update. iOS 7 natively has added many things that previously were big reasons I would jailbreak.
1) Control center adds super quick access to most needed toggles, brightness, volume and media player controls, plus a few convenient shortcuts. While not as extensive in toggles available, nor customizable, it has the big things. This takes the place of NC Settings and Jukebox (for me)
2) Notification center (which is improved, IMO...I like the Today view a lot) and Control center are both accessible from the lock screen. Takes the place of the main reason I used LockInfo.
3) Folders are multi-page. While you can't nest folders, multi-page folders without limits was the reason I used FolderEnhancer. iOS 7 works just fine for this need.
4) More visual multitasking with throwing off the cards as an easy way to close them. Takes the place of Auxo (and IMO, works better and is prettier than Auxo).
In addition to these things, the camera app and photos app are vastly improved, Safari is MUCH better, the visual design language is really nice IMO (though the icons aren't my favorite...but it grows on you), etc.
Overall, the additions to iOS 7 take the place of most of what I would jailbreak for.
If you are dependent on Activator gestures, or must have widgets, or are such a themer that the lack of customization would be painful (I love themes on my JB iphones, but I'm good for now), rely on the tethering hacks or other must-have tweaks, then it may be beneficial to stay on your JB iOS, but I think losing a JB for iOS 7 is far less painful than it was when I did it last year to iOS 6.
That said, when (if) there's a jailbreak out for iOS7, I'll almost certainly go that route for even further tweaks. Right now, the only tweak I really miss is SwipeSelection.