Have never bought phone on rumor or speculation. In this case both phones are not out, know little about 7 which are all rumors and even less about 8.
Quite frankly my 6s Plus is so fast, screen is so good my eyes couldn't tell further improvement. Downloads are super fast with MIMO connection with AirPort Extreme which exceeds my service provider's speed fourfold. Touch sensitivity is wildly fast. Pictures are so great, for my use I don't need improvement. LTE is fast, and am on wifi calling most times anyways, which is so fast connecting I answer before person calling even hears first ring. Battery lasts for days and using iPad charger I can load battery at one percent per minute. This iPhone does everything so well, I don't see a need to upgrade. At some point in future perhaps, but the actual product has caught up to the dream machine I have always wanted.
At $1,000 a copy, nothing in the rumors I have read prompts me to desire the next iPhone. Saturation of the market is clearly evident. And barring something entirely new that has not been envisioned we are now in evolutionary changes rather than revolutionary on all phones.
Going from my Razor flip phone to the iPhone 3GS was a huge step. Changed way I used phone. In reality it wasn't a phone any more, rather a hand held computer. Which is what all smart phones are now, hand held computers. Phone portion is an app, camera portion is an app.
First hand held computers with phone and camera features were too slow, communicated with limitations, and were crude by today's standards. The current hand held top end devices have solved all the drawbacks and have truelly become appliances. We may each favor a brand, but the differences have merged into gimmicks rather than true innovative differences.
As appliances, users tend to view the current high end phones more as tools and will replace them at less and less frequent rates as their current tool works just fine. I don't buy the latest hammer, breathlessly waiting on the new handle design, or the subtle changes to the strike head. The flashy new coating and engraved handle don't make me rush out to buy it and replace my perfectly good current hammer. This is where we have arrived with our hand held computing devices, once called phones. When it breaks, is lost, or wears out I will shop for it's replacement.
Sure a few people will continue to buy the latest gimmick. But we have reached the point where this piece of technology has matured. The phenomenal growth phase of this product is over.