Unfortunately, there are several reasons why Apple would think to prohibit its users from installing system-level "hacks" (as they would call them) or plugin extensions. The most "important" or foremost of which being that which will allow piracy. I am not endorsing Apple's closed system model, but simply stating one of its reasons. Deny it or not, such plugins can and will exist and as long as such are active, this will be a problem. I know, piracy is a completely different subject, but it's a reasonable issue affecting Apple's decision IMHO. I do have to say that the PRIMARY reason why I jailbroke was in order to add nonexistent functionality through add-ons. Heck, it's the same reason why I "hacked" my PSP so many years ago. I like having freedom to change certain settings, the kind of which that won't affect anybody else but me, and I am definitely taking the risk. As long as Apple uses an App Store model, it's as you say saurik. There will still be restrictions because Apple will be the middleman. As long as somebody is in control of any one thing, they will take the steps necessary to enforce their beliefs.