It is still not clear to me that the decline in ILC sales is anything more than maturing of the market, with the boom from ILC using photographers converting from film to digital mostly past, and digital ILCs with imaging [EDIT: typo!] performance good enough now that there is less reason than before to upgrade until the camera breaks. The "nova" scenario probably applies only to pocketable fixed lens digital cameras, and those are probably doomed no matter what the camera makers do: reducing their inconvenience compared to phones is irrelevant so long as the camera in a phone (or the one in the desktop, laptop or tablet) is good enough at effectively zero net size, weight, and cost. So to compete with phone-cameras, adding these convenience features would at best reduce "friction" with potential customers who have already been attracted by actual advantages, like more (optical) zoom or better handling of fast action + low light (sports, children).
Also, most of the features that Thom H. talks off might best be supported by the camera working wirelessly with a phone or tablet that can offer an existing cellular data connection, a powerful processor, and a far bigger and better touch screen than fits the ergonomics of a "stand-alone" camera. What ILC at any price offers a preview/review screen matching that of the latest iPhone or Samsung Galaxy S models?
As to ILC's; I agree with several above that for overall sales (not affected greatly by the profitable but far smaller high end sector) improving convenience will win many more sales than incremental improvements in IQ. I expect that the biggest change with interchangeable lens cameras and their lenses will be offering an overall reduction in the size and weight need to meet the user's goals for IQ -- for example, by making EVF-based systems good enough to displace the optical viewfinder for an increasing number of potential ILC buyers.