it was on once, years ago the program X-fire (said cross-fire) was on chanel 4
it was a team of 6 randoms agenst some minions with crap guns and a few gladiator style monsters with all the paintball tecneque of a gay bumble bee (little in joke there)
but it was crap cos after 10 min they had all been shot out and the only decent episode i saw was with some guys from the TA.
scenario paintball could work, but as said in a previous post, paintballing is a playing sport, how often have you gone down to a game just to watch? (unless your marshalling)