I really hope a big gaming company like blizzard would use crypto-currencies as their in game currency in the future, if Blizzard would use crypto-currencies instead of gold for one of their famous game Diablo, I believe there will be a lot more players playing it as there is a potential to earn some money while enjoying the game with friends.
Yes, if a big name company starts adapting altcoins as a currency it will surely blow up. We believe those big name companies are waiting for altcoins to be regulated properly so they don't get into any shady stuff. Also, not too many people know about or are comfortable enough with crypto to make companies adapt it.