That's the real thing. Those of us posting on here regularly are a very small percentage of users overall. The majority of people will NEVER swap a battery unless it goes bad. Even on the Inspire with it's tiny replaceable battery I never swapped it for a fresh one. I would just charge it as I needed to.
As soon as I realized that I was more ok with having a non-removable battery. It's a different story if you are literally not around a charger for long periods of time (like a construction worker or something like that). But even then, you have to carry the battery with you, and then figure out a way to recharge that extra battery, which, IMHO, is more hassle than charging a battery bank. The big difference is that with a battery bank it needs to dangle off you phone to charge it, as opposed to just changing batteries. But at least the battery bank can be charged through USB, where the spare battery needs its own charger.
I agree that storage is the bigger issue for most people, but again, people will learn to adjust. If they find that they can't deal with they'll get something else. I've been managing just fine without doing anything different or extra than I did with any other phone. That is, I just use my phone and don't worry about it. I haven't ran out of space yet, and if I do it'll be because of pictures, which can be taken off and deleted.