If you accidentally upgrade to iOS 8.1.1 or any other non-jailbreakable firmware in the future, it's always a good idea to go out and check Apple's signing window to see if you can downgrade your device to a previous firmware. For example, if I upgrade my device to iOS 8.1.1 today, or if I want to check out Apple's iOS 8.2 beta, I know that I can do so and downgrade back to iOS 8.1 with no issue.
But remember, Apple's signing windows are subject to relatively quick closure. It's been four days since Apple released iOS 8.1.1, but the signing window for iOS 8.1 is still open, making it possible to downgrade now. That can, of course, change at any time. In fact, Apple could decide to close the signing window as you're reading this post.
For that reason, its a good idea to downgrade now if you ever want to jailbreak iOS 8. But it's also good to get familiar with how to check the signing window, and this handy website allows you to do just that.