Let's face it, Apple is using it's monopoly power to force developers to use their app store in order for them to install apps on user's phone(and have to pay a tax to do so). How Apple got away with this for so long is beyond me. Imagine if MS locked down Windows and Apple iTunes had to pay MS 30% for every music and app store transaction that occurred on MS windows. Woulda been unheard of. iPod may never existed and digital music downloads may be $1.50 per song vs. $0.99/each.
Bottom line, Mobile Phone OS is no different that desktop OS and the restriction imposed for owners of iPhones from being able to install apps outside app store is outrageous and can't last forever.
Apple does not have a monopoly power of any kind - they don't hold the majority of marketshare with any platform let alone enough of it to call it a monopoly. A phone OS is MASSIVELY different from a desktop OS, even at the kernel layer...