This is basically the worst-case scenario for Apple in terms of jailbreaks: For the first time, there's an unknown corporate actor calling the shots, and the high code-signing security of iOS 7 has backfired, causing this to be the only jailbreak on the market.
If this becomes anywhere near as popular as Evasi0n for iOS 6.1 (over 7 million downloads in its first few days), Apple will have not simply lost control of the platform to a bunch of power users, but to a well-funded entity with unclear motives.
Apart from trying some kind of political game in China to shut this down (I don't know how much pull they have there for this sort of thing), I see only one solution, which is to change the rules of the fight: Port Gatekeeper to iOS. Kill the market for jailbreaks altogether.
> (over 7 million downloads in its first few days),
> Apple will have not simply lost control of the
> platform to a bunch of power users
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.
Apple also will study it to find their security hole and close it in an OS update.