Well it is plausible but in no way the best option yet. Ni no kuni is like a 20 gig download, that's too big I'm just going to say it. So the options are wait like two weeks for this to finish downloading or buy a disc and play it now.
Playing it now will always win that fight. Even if it was like two hour download, I'd still just go buy the disc, because then you get the box to go on the shelf. It's not matter of impatientce either.
Killzone shadowfall is 50 gigs fuck your digital future