Vanillaware does not own the rights to the game. Previously Ignition did, but Index bought the rights from Ignition and took over as publisher for the game, funding the rest of development. If they are unable to release the game for whatever reason, an interested publisher would have to purchase those rights from Index in order to release the game.
I have a feeling that Sony will be the one to publish Dragon's Crown, and that will push them to buy Atlus. When I think Smt, I think of something dark, hip, trendy, cool, and I could see it becoming more than just associated to the Sony brand. I look at output, and I see Sony studios putting out many games, when I look at Nintendo and their novelty franchises such as fire emblem, I see less and less instalments with every system. The truth is FE awakening was going to be the last game in the beloved series. Also, Nintendo bought monolithsoft, but we were greeted with one solid game last gen. Now we have x and project x zone. I'm happy, but is that all we can look forward to? If hypothetically Sony can get Atlus to keep the same pace in terms of output, I'll be happy, but I just can't see Nintendo doing this company's legacy justice, as disorganized as they are now. Hard times ahead, but I'm sure someone will scoop them up if it comes to it.