There is a common factor to most or all of companies of camera systems that have failed or are struggling in the digital transition: being tied mostly or entirely to film formats like 35mm and larger (in particular Bronica, Contax, Rollei, and the medium format divisions of Pentax and Fuji) or being slow to make the investment necessary for the transition (Kodak, Konica-Minolta), and even being slow on the previous transition to offering the option of auto-focus.
The camera makers who embraced new digital formats early enough, either fixed lens compacts or SLR formats like DX, EF-S and 4/3, are doing fine; maybe even the formerly struggling Minolta mount DSLR system now that Sony has taken over. In particular, the latest quarterly and semi-annual reports from Canon, Nikon, Olympus and Pentax are all quite healthy on digital cameras. Of those, Pentax seems the weakest on profits, but I believe that Pentax along with Minolta were already struggling by the end of the film era.