That makes no sense. People only want more right now because Apple hasn't given everything they're already used to. Once Apple brings things up to parity with other smartphones, nobody could ask for more.
I think it does make sense. Then again I would because I wrote it. What I'm trying to say is, everyone always wants their device to do more, and while there's nothing wrong with that I'm not sure that splitting an OS is going to make that work. Some real morons get on with making android work just fine, despite the bells and whistles most people don't even go there so if apple were to add all this stuff, just make it in the main OS. Which leads me to:
1) You pretty much obliterate most of the reasons somebody would buy an Android phone over an iPhone. It would definitely bring in a big chunk of Android users because a lot of them just want a phone that does what their old Symbian or Blackberry phone or WinMo smartphone did in the pre-iPhone days and the closest thing to that is Android. Once you get all those features from those old pre-iPhone smartphones into the iPhone, Android will pretty much see a sharp drop, and RIM Blackberry users will finally leave RIM dead in the ground too.
2) The added cost of a pro version's development would be tiny compared to the returns they'd get from new users. Do you really think that they're spending that much money on iOS development considering how disappointing iOS6 beta has been? This would be the shot in the arm Apple needs to come out on top and destroy the competition.
I think the trouble (yours and customisers) is that apple appeals to 'what most people do' not a lot of point in wasting time developing things that only a relative handful of the consumer base will use. Like I said before, most customers will either go for a phone that's a) cheaper or b) looks nicer to them. Not everyone is like the image people portray an android user to be (some kind of Linux freak that needs to have control over most aspects of the phone). From both Eco systems most users just want their phone to make calls, browse the net and probably at a lush get their email, along with the dumb phone things they've been getting forever like a camera. Sad for people that want their phone to turn Bluetooth off on their lock screen but there's the long and short of it.
Business users want a phone that will get their email on time and be able to send, calendars synced with their exchange servers and contacts imported from their GALs both iOS and android can connect via VPN so that's basically business covered right there.
So no I really don't think that even hundreds of thousands of people would switch to android if apple implemented all your suggestions, android does most of them (well the few phones that have been updated to ICS)
Newsflash: apple, or google for that matter just need to keep developing an OS and releasing hardware (or partner hardware in Googles case) to kill RIM, they're just too late.
I think you guys are smart enough to see that iOS6 pro wouldn't be feasible on 4 year old hardware. Besides, people moan every time an old phone loses support. Who cares?
Do you know what, yes I am smart enough, but there'll be some dopes out there that aren't and think that they should be able to have whatever feature they want on their phone... Funny, that.