Most professional photographers who used DSLRs ten years ago are still using them. Electronic viewfinders are fundamentally inferior in terms of the viewing experience and battery life, but have other pluses like light weight, low cost and configurability (all of which amateurs prioritize more than professionals).
It is not a huge loss though, because pros almost exclusively buy their DSLRs from Canon and Nikon.
It is not a huge loss though, because pros almost exclusively buy their DSLRs from Canon and Nikon.