In my mind, I have this huge Dieselpunk world where you have gangsters, zeppelins, heroes, and of course...MAD SCIENTISTS! But I haven't seen or heard anything of such recently. Dr. Horrible was able to bring them back in a small way, but I haven't seeen or heard of any evil geniuses other than him. Are they dead? Is there any way to bring them back?
Was the one time popularity of mad scientists just directed at Nikola Tesla? He was a lone wolf and worked on some pretty unconventional stuff. Personally I like him because of his contributions to modern society, like alternating current and radio. However in his time he had some detractors among more mainstream figures like Thomas Edison and Guglielmo Marconi (the guy who tried to patent radio in the United States, but was ultimately unsuccessful because the U.S. Supreme Court ruled in 1943 that he could not because radio is based on things that Tesla had already patented).