It takes about 5 minutes to jailbreak an iPhone. I expect similar, and add'l on the iPad. So enough with these "the future of computing / young programmers" are at risk because of Apple.
We'll always have choice - Google's entire strategy was being the opposite - open source, open apps, etc. There are dozens, if not hundreds of Android tablets, and concepts coming in the next 18 months, not to mention Windows 7 mobile etc
The Windows 7 mobile platform is just as closed as iPhones and iPads, and Apple is trying to have Android shut down by the courts. If they get their way, there will be no viable open alternatives for mobile computing.