Like you said, I don't think that this will happen too because the health of the fighters is more important than the money. Fighters will not risk their lives because they might be infected too with the virus. I'm not expecting this too happen and maybe he is just bluffing
.They won't be infected because they will be taken in an island, all of them will be check, and therefore they can assure that no positive with covid-19 will be taken. the only way these people can gain an audience is through live streaming and this would be possible if maybe will subscribe in a PPPV which I think people would do be more interested now as they are just staying at home.
Somehow, I remember about Mortal Combat movie that has a competition on an island. The audience is watching the match on their home, while some of the people betting for who will win. I think that will be like that so people could still have entertainment, and they can place their bet to their favourite players. I guess that feels the same if we bet on the gambling website like usual, and perhaps, that can attract more people to watch the match in these situations. If many people like that show, they will watch and bet for that.