Minor nitpick: "Port Gatekeeper to iOS" doesn't make much sense; the built-in FairPlay DRM and code signing stuff is already a "gatekeeper on steroids". It's exactly the type of protection that a jailbreak would work around.
Pretty sure that by "Port Gatekeeper to iOS" he's talking about giving the users the ability to choose whether or not to run signed (or unsigned) code that doesn't come from the AppStore, exactly like you have on the Mac (see the bottom of the "General" tab of "Security & Privacy" in System Preferences.
Oh, you're right. That argument makes much more sense!
Unfortunately though, I doubt we'll ever see Apple giving up control of its App Store. They'll patch this one and move on, like always, making future jailbreaks even more difficult to produce.
At least the major publicity around jailbreaks means Apple will take these vulnerabilities seriously and patch them quickly. Which is a very good thing for the security of regular users. Scary to think of how long 0-day vulns like these would stay alive if there weren't in such demand by tweakers.
