Doesn't mater whether film or digital, the heart of a camera is the lens/optics.
In the days of film, we had simple "point and shoot" cameras for Joe and Jane Average, and high-end SLRs with interchangeable lenses for the pros or the serious amateur. And that hasn't changed with today's digital cameras.
You can change the technology from film to digital, but you can't change the basic laws of optics. Light is light, a lens is a lens, whether the "receiving end" is a piece of photographic film or an electronic surface. A good lens will always be the defining element of a camera, and professional photographers will always want a wide selection of lenses to meet various applications and situations.
So bottom line... we've gone from film to digital, but the basics of optics have not changed, and we still have the simple point-and-shoot camera for the average guy, and the more sophisticated SLRs with a wide variety of lenses for the pros.