I wouldnt call RW a format that appears to have failed. The BBC did try a different format with Mechanoids that did fail. If they did their market research they will find that the RW format is still popular the problem being is that there would be legal difficulties with accusations of plagiarism being made by the owners of RW. The problem is that robotic combat is exactly what it says on the tin - there isnt much scope for making it differently.
Perhaps a mixture of both new formats like 8Ack and putting across the internet could be a solution. Both event organisers and robot teams could promote this (and themselves of course) much more easily than if it were on mainstream TV.