I can't take it. I really can't stand reading how so many of you take an article, believe it to be the TRUTH, and then start shaping reality (and common sense for that matter) to fit it.
When something doesn't fit, throw it out. The 4S will not be produced beyond 2013. You might be able to buy it in a mini mall in Wyoming until December, but that does not have any significance other than filling out inventory channels so that outlets don't dry up amidst the big change that's coming.
As for Apple stores and most carrier stores....you will not be able to purchase an iPhone other than 5S or 5C beyond the September 22nd launch date.