In a recent interview with AmateurPhotographer at CES, Toshi Terada from Olympus confirmed that they may go back to producing DSLR cameras one day:
"Nobody knows 10 years away... once we can get a very nice share [in mirrorless] we may expand the business to DSLR again, but at this moment we are just concentrating on mirrorless and we have no plan to go into DSLR."
Mirrorless sales seem to be falling in Europe and in the US. Maybe in the future the Western world will continue to be dominated by DSLR cameras while the East will be all mirrorless. A recent NYTimes article suggested that only Nikon, Canon and Sony will survive the smart phone camera age. Mirrorless cameras may not have been the silver bullet solution everybody has hoped for.