Do you think it will help bring in mass adoption?
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So I don't think this will be too big because maybe only a few people understand.
Unless Steam or the game developer gives an option to buy their game credit using cryptocurrency, that might affect to mass adoption. Well, that's what I think.
Well not directly but I can buy Steam Wallet using Bitcoin actually in 1:1 with my local app (Coins.ph),and I hope other countries would consider doing that also.
For the OP, I don't think that it would cause that much of an impact.
There were already betting sites for CS:GO that I just heard before, I don't know if that involves crypto but it pretty much aims the same things as these.