Wow, this is the kind of discussion that could go on for hours -- on bar stools!
Since I'm a teetotaler, I'm going to make one point -- then head for the door.
Back in the film days, the "sensor" was a very mature technology. There are a few people around today who will suggest film chemistry could be dramatically improved, but really that's just picking the fly scat out of the pepper when compared with digital imaging.
Today's optical sensor technology is not mature technology. Over the last 10 years this upstart has evolved so fast (consistent with all new technological applications) that camera makers have had a dicey time keeping up with it well enough to formulate consistent product offerings. Development has slowed a bit now (and manufacturers have also gotten more control over the "development" so their engineering and marketing folks can get some breathing room to establish the kind of baselines that money-making entities like corporations so adore.
Almost overnight we've gone from a mature technology with limited possibilities to a radically new technology with almost unlimited (longterm) possibilities.
It's been a hell of a ride so far!