You make a great point. I guess where I am coming from is that instead of spending all this effort remaking something that is already pretty good, why not make something completely new? There is a ton of manga that could do with some animation.
A few years ago a friend gave me a boxed set for Gatchaman. That's even older than Ranma 1/2. I have very vague memories of watching the English dubbed version of it once or twice when I was a kid. I took that boxed set and put it on for my 8 year old (at the time) and he loved it. No need to remake it to give that exposure to a classic series.