I, also, would like a Star Trek tricorder.

I was going to come in with a set of reasons why these wouldn't sell, but... I think they could! Air quality fits neatly into Apple's health push, though I could see them making that a Watch feature rather than a phone feature (since your phone lives in your pocket, and quality sensors need time for the readings to stabilize). 3D imaging and synthetic refocusing both have a wow factor that would be easy to get people excited about. The only one I'm unsure of is multi-spectrum imaging; while I suspect pretty much anyone on this forum would jump at that, I don't have a good idea of whether the general population would get excited about temperature data. At the very least, it'd be handy for some kitchen tasks where you need a surface temperature.

The Google Pixel phones have a temperature sensor (1x1 though, not a full camera). I use it a couple times a month...

We also have a Seek phone attachment camera. It's cool but again, don't use it in daily life that much.