Apple Considering Switch Away From Intel For Macs
concealment sends this quote from Bloomberg:
"Apple Inc. is exploring ways to replace Intel processors in its Mac personal computers with a version of the chip technology it uses in the iPhone and iPad, according to people familiar with the company's research. Apple engineers have grown confident that the chip designs used for its mobile devices will one day be powerful enough to run its desktops and laptops, said three people with knowledge of the work, who asked to remain anonymous because the plans are confidential. Apple began using Intel chips for Macs in 2005."
From the Wikipedia article on iOS: "iOS is derived from OS X, with which it shares the Darwin foundation, and is therefore a Unix operating system." So a change from Mac OS X to iOS would not shake the UNIX-ness of the operating system. What you seem to fear is the system being locked down, but that could be done with Mac OS X as it is, if Apple so wished.