Old?
While they have not gotten much press in the US, Ultraman is STILL GOING. A new movie was just released in March 2012. They've had some hiatuses in the past 45 years, but the Ultra Series (the collective of Ultra Men movies and TV series) still going strong in Japan and currently has the Guinness Record for most spin-offs. Ultraman Tiga came to the US in 2002 on FOX, but I am not aware of any moves to bring more to US mass market. (Maybe they don't know how to squeeze in past the Super Sentai (Power Rangers) juggernaut to get some screen time.)
As for Giant Robo (Johnny Sokko and his Flying Robot), that got an awesome reboot in the 1990's, with a direct-to-video series that has been translated and re-released globally. One could argue that it is due for a return to the large or small screen.
As for corny...I dare you to look at any TV series or movie from the mid 1960's and not think it's a little "corny." Let's see: Bonanza, Bewitched, Gomer Pyle USMC.
