Nintendo and Monolith can take as much time as they need. I would much rather wait a few extra months for a game that is polished and near complete than pay $60 dollars to get conned into being a beta tester.
“What I say is, a town isn't a town without a bookstore. It may call itself a town, but unless it's got a bookstore it knows it's not fooling a soul.” - Neil Gaiman