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Can a cold offline wallet be used like with NEM?
Im not familiar with the using of XEM, so, of what you may fully mean I may not be entirely certain, but-
Yes - you can backup a wallet file to store offline and create another wallet for online/network use.
We all need to get used to backing up (2-3x) and encrypting ALL wallets. For wallets are but files in folders, and the money but data.
Is there any intended future use of this coin?
Yes, to kill White Walkers
^ Yes!!!! Indeed!
And though, as Season 7 finished with ~12million U.S. viewers- plus, it being the digital age, and all... I am also quite certain we as such an already strong fan community can find real world uses for a Game of Thrones digital currency - {not to mention encrypted & anonymous transactions}
AND {Dragonglass} kills white walkers.
Also, a raven came some time ago from an HBO... for you.
https://www.hbo.com/game-of-thrones/season-8-returning-2019.html 
already 9gag here, its very funny that someone is trying to scam over something popular. Goodluck with killing walkers. 
