Originally posted by monochrome I was going to say that multiple lenses is one thing that cell phones have over ILCs. You don't have "real" cameras with 2, 3, 4 image sensors and the ability to combine a number of simultaneous shots computationally.
But why not? Why couldn't you have an ILC with a 50mm or 28mm lens mounted, and several smaller sensors with fixed lenses like a cell phone on the body? The ergonomics might be challenging, but you could put small sensors on the hump at the top, or in a popup flash type mount. Obviously they wouldn't be the size of sensor or quality of lens of an APS-C or FF camera and a good lens, but you might be able to extract enough valuable information to improve image quality in a lot of challenging situations. With enough processing power you could potentially combine several exposures with the primary lens, with exposures at different focal lengths, depth of field, exposure values from the smaller lenses and get otherwise difficult or impossible results.
Maybe you could even use the extra imaging sensors to feed data to the autofocus algorithm for better tracking and accuracy with a DSLR? Again, accounting for various focal lengths with your interchangeable lens would be a challenge. But, hey, it's just software, right?