Apple, regardless of stock price, is not going anywhere, Nokia/Rimm never reached anywhere near Apple's profitability, it is here to stay and with TMobile launch and cheaper iPhone and heaven forbid a large screen option Apple can put a lot of pressure on Android. Heck the only reason I am using a Galaxy Note is because of the screen size.
None of it will improve profit margin unfortunately, Samsung will see this too as today's Smartphones are too powerful for everyday usage and most popular games are all low graphic 2D games. Unless some amazing apps / new ways to use our phones come out, the industry as a whole has peaked and price war will squeeze everyone's margin. If you have a Galaxy S3/iPhone 5 why upgrade when nothing in app store requires it? Hardcore users who upgrade every year can not carry the market.