Sony is the other currently successful camera maker. They bought Konica-Minolta, and made the switch to mirrorless early. Most importantly, they manufacture the best sensors that everyone else except for Canon uses.
Most of the current digital camera brands were analog camera makers. Panasonic is the exception and they partnered with Leica.
Clearly, they'll still be the go tos for pros and advanced amateurs for a long time but that's barely a mass market.
Sony did successfully use digital to become a respected camera maker--and they still have some of the best cameras in their category today. But, by and large, the traditional consumer electronics companies focused on point and shoots, which have been almost totally erased by phones.
There was supposed to be a format standard for lenses to solve this problem, but one of my camera-snob friends pointed out that while you can physically thread the lens on another body, things like autofocus probably won't work. So in the end it got people to buy new lenses but still not be able to pick best of breed from each generation.
There was a long time there where everyone thought the startups and the consumer electronics companies were going to win. Wasn't there a time when Sony had the best digital cameras? Digital cameras were one of the big 'disruptions' in the early information age.