I actually disagree, I think the success of the iPhone has proven Apple correct that people don't want to deal with "files." Personally I despise it, but as iPhones have become nearly ubiquitous in the US, I can't help but feel the sting of being in a minority group that actually wants a general purpose computer rather than an "appliance"
You can't really evoke revealed preference here; there's a lot of incentive for platform builders to lean away from general-purpose use and towards appliance-ification, and there's no real option on the market for consumers to flock to if they want a capable general-purpose pocket computer.
I hope you are correct, but I'm skeptical. May I ask what demographic? Among the youth, nearly 90% or more have iPhones, seemingly regardless of socioeconomics situations.