Here's a thought:

Apple made iPhone 6 for iPhone users, and iPhone 6 Plus for those switching from Android.

If I haven't already lost you, hang in there and hear me out. 

Based on the reviews I've seen so far, and my own personal experience with impressions, the current iPhone user base is largely in the iPhone 6 camp. They're firmly rooted in the 4" is the perfect size category, and don't want to go bigger, but want Apple's latest. And they firmly agree that iPhone 6 Plus is just too big - it's just a small iPad mini. 

Meanwhile, there's another crowd that seems to believe that Apple will be able to create an entirely new class of devices with iPhone 6 Plus, and it'll be unlike anything we currently have. It'll merge the best of tablets with the best of smartphones, and we'll just completely ignore that Samsung has basically been doing this for years. It seems to me that this opinion is generally held by tech savvy individuals (MG Siegler) and/or tech reviewers (Jon Rettinger) who aren't overly fan-boys (David Pierce): essentially, people who frequently use larger Android devices tend to prefer or acknowledge the benefits of iPhone 6 Plus. 

And that leads me to my thought: perhaps Apple made iPhone 6 for Apple people, and made iPhone 6 Plus to woo switchers. 

There are other reasonings too - 6 Plus has more big name specs (even though they're essentially meaningless) OIS, 1080p, two day battery life, 5.5" screen, NFC (kinda). iPhone 6 is more about "look, it's pretty and fairly priced and better than last years in a few ways." Apple people tend to buy the new iPhone because it's pretty and slightly better. Android people want the best thing readable on paper. Make sense?

Let me know what you think in the comments below. Do you want an iPhone 6/6 Plus?