[Tyrannosaurs]

A few reasons why I think this will never happen:

* Taking something away from someone that they've always had (as would be the case with OS X) is very different to never giving them it (as has been the case with iOS).

* People are used to doing stuff that isn't possible with the current restrictions - with iOS they've only ever had those restrictions so they're not aware of what they might be missing out on.

* Developer goodwill would evaporate overnight. I'm not even sure it would be possible to develop on a Mac with this sort of restriction in place given the low level activity you often need to play around with.

* They'd need to develop a parallel mechanism for managing machines or lose what little they have of the Enterprise who are never going to use the app store.

[nsxwolf]

They'd need to make a "developer version" of OS X, which would just be OS X with this hypothetical super-Gatekeeper shut off. Then the whole thing just gets silly.

I believe the PC will remain a PC. Take away its nature and you might as well just hand everyone an iPad.

[Tyrannosaurs]

I can see them changing the language around the various Gatekeeper options and adding additional "are you sure?" warnings to scare people off the allow everything option and unsigned / non-Mac App Store installations but I don't think it will go any further than that.