I don't think the biggest problem is portability, sensor size, in-camera or in-phone effects, connectivity, etc. I think the biggest problem is "the value of an image". Most people are so inundated with dozens, hundreds, or even THOUSANDS of pictures a day that at most, a single image is in front of their faces for a fraction of a second. There's simply no time for the average person to appreciate the uniqueness, subtleties, and nuances of a particular photo - much less the artistic impact it makes (or, could in theory if one were to give it some time).
Sure, top-tier photography will still stand out, even on FB and Instagram, but "the masses" - who in the past may have purchased a dedicated point and shoot or even a low-end DSLR - have a hard time getting out of full-auto mode and capitalizing on the strengths of these cameras to make their images more appealing. Instead, they'd rather slap an ugly *** filter on top of it to garner the extra fraction of a second it takes from their friends to elicit a "like" before they move on to even more images from others who NEED likes in order to bolster their self-confidence.