I think I was the first guy to propose to use NXT as ingame currency, feel free to approach any of the big game devs. Got nothing to lose
Nothing to lose, no. I'm going to play devil's advocate and say 'it ain't gonna happen.'
Blizzard? I couldn't even buy a friend a month's game time credit for his birthday, found nothing on any of their online assets. Called them personally, and the only workaround was to buy my friend a (soon-to-be-discontinued!) Diablo 3 RMAC in-game card, which could then credit their battle.net account. Blizzard is moving away, at least temporarily, from fiat for in-game transactions.
I can foresee maybe a notable dev here or there accepting a crypto for a monthly or annual sub. I see virtually no chance of accepting a crypto for frequent, recurring transactions. Apple, Sony, Microsoft, Activision/Blizzard et al will open their tills 10s of thousands of times a day for 1) fiat the central bank issues or 2) a crypto they issue when the time is right. Blizzard will never accept bitcoin, let alone NXT, as an in-game currency. They might eventually accept a blizzcoin.
One notable may be someone like NCsoft (South Korea, Guild Wars)... an Asian attitude may be more open to a crypto in-game currency for micro transactions.
Small indies/devs that aren't beholden to a board/bean counters? Definitely.
Games are centralized/controlled; user-driven game environments (like what we're trying to do with Nxtopia) is where in-game cryptos will shine, I think. Players crafting in-game assets for other players are incentivized from multiple angles. They're definitely behind the steering wheel.
Another possibility, I think I mentioned this in my first Nxtopia post -- a Fantasty Football (US football) service. I'm not sure if there's a European, Asian or South American analog, but fantasy football is huge in the States. Setup the stat tracking, set the payout tiers, give the players the ability to craft side bets ("if you beat me in week 3 by more than 15 points, I'll pay you 100 NXT. Shit, lost that bet... 200 NXT if I rack up more than 120 yards rushing in week 4.")
Just my 2¢ -- we need to concentrate on social/user-driven content and and nimble, forward thinking devs (altho it's not a game, someone similar to Damelon's investment contact).