If lots of people were willing to pay that much it seems likely that something would appear.
The work Acorn and WSS did for Replay for ROS4 really needs finishing. It was a way to allow video decoders to output to Replay without having to mess about with the image filesystem route. There's no standard for playing video on RISC OS anymore, we have Replay, Cino, Kino(amp), Cineroma.
The Flash specs are freely available for anyone who wants to write a player, and apparently the realvideo codecs are free for r&d and 25c/unit for commercial use, they're probably worried about MS's wmv format so want it working on all sorts of portable devices.
CLI java stuff seems ok, but the RISC OS specific parts are a lot of work.