Re. smartdevice cameras: given that my current iPhone has two lens/sensor combos, one offering ~28mm and the other ~56mm "equiv," I can easily imagine a future iPhone with a third and even fourth lens along the top back of the thing. Take it a step further and imagine the 3 or 4 lens/sensor combos working together in various ways.
More cameras-per-phone is coming, but there are some severe limits on telephoto reach (technically, on angular resolution) beyond about "short portrait lens" in a conveniently pocketable camera.
On one side, the desired slimness limits [actual] focal lengths to about 7–8mm. On the other, the wavelength of light limits minimum pixel size (sensor resolution length scale) to about 0.7–0.8 microns. So the ratio is probably limited to about 10000:1, or crudely, 0.0001 radian angular resolution. Better than the human eye, but what "equivalent focal lengths" are achievable compared to ILC systems?
For 12MP (4000x3000) 0.8 micron pixels give about a 4mm image diagonal, and then 8mm focal length has equivalent angular FOV to about 43mm in 4/3" format, 47mm in APS-C, or 85mm in 35mm format. (Same for any 10,000:1 lens/pixel ratio.) But those ILCs have a lot of cropping latitude when 12MP is enough, and allowing for crops to 12MP, that matches about 34mm on a 20MP MFT sensor, 40mm on a 24MP APS-C, or 60mm with an entry-level 24MP 35mm format sensor. So even standard ILC kit zooms have more reach that any normal(*) phone is likely to have, and any telephoto lens of "all-in-one" wider ranging standard zoom lens is way ahead, and will stay ahead. Add in the small actual aperture diameters and low usable ISO speeds of those phone-size lenses, and the telephoto performance gap to even entry-level MFT gear will continue to be easily visible to even casual users of "telephoto".
Change the MP target, and cropping to the same MP from an ILC gives the same focal length comparisons.
On the other hand, a lot of people are satisfied with a mix scenery, group photos, food, and "portraits", and that gamut will be ever better handle by camera-phones. The entry-level ILC market needs to target the weaknesses, ultimately imposed by very small lenses (and the wavelength of light), no matter how good sensors and in-camera processing get.
(*) There might be a market for less normal "chunky camera-phones", with bigger camera bumps or such to allow longer lenses, though so far all such efforts have failed. Even then, I cannot see getting beyond matching about 60mm in 4/3" format when cropping to equal pixel count—and that is ignoring the likelihood of smaller photosites and thus even more cropping latitude in ILCs.