I hate to pour cold water on what at first seems like a good idea but...Rough terrain robots.
Roger plant did indeed build one, complete with on board camera for remote driving. and a paint ball gun to score points against the opponent. Great fun!!!
The problem is how do you get the public to view in safety? and pay up for the privelage.
Rough terrain robots are not cheap to build and would be trying to reach an audience more inclined to go to stock car demolition derbys or off roading and rally events.

Maybe we should all become shareholders in a robotting company so sharing the work load and the profits (or losses) Maybe we should avoid the costs and audiences and just fight among ourselves on any bit of flat ground that we can corden off for a few hours.
I just want to keep on fighting robots.