The beginning of the end of OS X... It has already begun with Lion... What's next? Removal of multitasking altogether I bet! Let's waste all that CPU power on something more important than multitasking.
BTW, it's already done in a certain way in Lion with the resume stuff and the memory management. But why the heck waste cpu power when you can just put on hold some application and keep some important process in background such audio, video feeds, rendering, downloading, etc...
The iOS multitasking ain't perfect but it could be a good start... Just to compare, if I do have Mail, Safari with several tabs, iTunes playing music, Skype open, I can easily use more than 3Gb of RAM on my Lion Macbook. Just add some iPhoto, iMovie and iWork stuff and my system start to slow down (mainly Safari) since I'm only having 4Gb of RAM and a Dual Core CPU.
Now I can do the same stuff on the iPad and it won't slow down... Safari will stay fast all the way, for a similar usage.
I do believe the next phase to improve iOS might be to add the "File Management". Maybe not Finder, but at least an easy way to centralized your Documents, Manage them with your other devices (including iCloud), easily send or open it by another app, etc...
And the next OS X step will be to get rid of current "File Management", by reducing features to the strict minimum to your Documents only. They already start by removing the /Library folder, changing the Places and Drives categories in the sidebar, and even the need for different files for different versions. Who need to rename a file anymore for -old, -new, -version 2, etc...
@rcp27: Completely agree with you! To add on your two last paragraphs, don't forget now the gestures on the MacBook Air Lion, will be very similar of the gestures on the iPad iOS 5 too.
I'm kind of pissed off I can't have my 4 fingers swipe down for Mission Control, but only 4 fingers Up. But when you see that the 4 fingers Up on iOS 5 on the iPad will just reveal all opened Apps, it would make sense then...
Regarding the file system. Who said we couldn't get Terminal on iOS in future? The same way a lot of things weren't there in iOS 1.0, doesn't mean it can't be available in future. Same with "Finder" or even Xcode. If and when Apple will need to get more professional and evolved features for iOS, they could do it.
By being "PC Free", they did remove the need of a computer to use the iOS devices. So it would make even more sense in future that we could even program iOS apps, directly from the device by itself. And by the time they release iCode (which will be the new Xcode version for iOS), it will be so simple and easy to use than everyone will want the OS X version of Xcode to look similar... Just like they did with Mail, iCal, Address Book and pretty soon with iTunes.
And finally, regarding the CPU power, you are just thinking on a tiny scale guys. A 75 billions dollars company who already design CPU can easily have a complete line of future CPU, from mobile Axx low power, low energy consumption to a desktop Axx for high power and higher energy consumption...
Nobody says the Mac Pro will ever get the iPhone CPU or even the current iOS. Think outside the box on a large scale. By designing their own CPU, they will also avoid "again" people to run OS X on other hardware.
And for the user experience, as long you can do everything you want, do it fast, having great graphics... you don't care if it's an ARM, an Intel, or even an Alien Technology CPU inside the box. People just want the box to work...