Can I uninstall Cydia entirely and still use my jailbroken iPhone?

I have a jailbroken iPhone 3GS iOS 4.1 and my camera shutter won't open. It's not a hardware issue (every now and then for no apparent reason the shutter will work). I read on a forum the issue could be some Cydia packages installed. So I want to kno: can I uninstall Cydia and still be able to use my iPhone?

Nope. Not without unjailbreaking(restoring) your phone.