No. You cannot restore to old firmware when new firmware becomes availble, unless you have a full-version SHSH. There are multiple reasons why you might need to restore after 6.1.1 comes out. And if you find yourself in that boat and the devs haven't found a way to make OTA SHSHs work or made a 6.1.1 jailbreak, you will be forced to update to 6.1.1 and you will lose your jailbreak. 6.1.1 is jailbreakable, but there is no guarantee we'll see a jailbreak for it soon. It's just a matter of time, one of the upcoming updates is going to break the jailbreak (probably 6.1.2 or 6.2), so that 6.1 SHSH is crucial. Like I said, you can do this any time before 6.1.1 comes out.Wouldn't you have to upgrade to 6.1.1 first before it became an issue?
This only takes TEN minutes. It surprises me that there is so much resistance. I guess it's because people don't understand the importance of backing up their blobs.