Should I update to iOS 7 when it comes out?

I mean I don't know if really want to update my iPhone 4. Since once update you can't downgrade. And iOS 7 looks alright with all new stuff but I'm might miss the old iOS lol but would you update it?

Yes you can upgrade your iPhone 4 to ios 7. But iPhone 4 is now pretty much a very old phone and won't be able to handle new apps or graphic intensive apps like games. Upgrade to IOS 7 with no problem but their MAY be a possibility of lag due to outdated hardware and new animations and etc. But apple made some adjustments to make IOS 7 smooth as possible for iPhone 4 owners when IOS 7 is iPhone 4's last major IOS update which means you won't update to IOS 8 next year. And yes once I saw IOS 7 announced I didn't really like it but after getting it by a developer account I actually liked the new UI and got used to it. Everyone will get used to it.