Truthfully, the most they could milk out of Ranma now is another OVA block and one movie--Herb and Ryu Kumon, and the final arc with Saffron. There really is nothing else to Ranma.
Personally, I'm afraid of any studio nowadays pulling off any kind of "revival". I adored what little I remember getting a hold of back in those years, but I also know that, like now, there really were a lot of bad ideas and shit titles that weren't buried by the diamonds because we had people on both sides with limited trading ability. No fast and convenient circuits meant the amount of shit we were exposed to per season was drastically low. Anonymous only recieved diamonds, and even then we were picky.
That's the major difference between then and now--the pipeline is wide open, and every tom, dick, and harry can stream something. So the noise to signal is horribly unbalanced.
My point is, the 80s are only epic through rose-colored glasses.