We can see it when Bitcoin will be legal because in some countries Bitcoin is banned so you can not pay players with it and then they loose it.
But I don't think that it will happen even when it will be legal because its value is so volatile.
First of all, for the volatility of the bitcoin value I think if the both sides : sender and receiver are agree to be dealing with bitcoin.
Second, the legality of the bitcoin is only a matter of time, sooner or later Bitcoin would be legal and the transactions would increase. Which will engender an explosion of value too. Finally, I want to remind you that with bitcoin everything is possible !
You're right dude, as long as both side have an agreement about to transfer a bitcoin which need a bitcoin address in terms of payments. Also, gain trust to each other so that it will continue to next game or next event that they playing. I believed that in the future this kind of transaction as the bitcoin is set as mode of payments like on buying in the department stores which you just pay by transferring your bitcoin as what players did having a great and agreement of each other.