While there is a lot resting on the success of the NX for Nintendo, I'm not sure it will be the make or break scenario that a lot of people think. Nintendo have made mistakes in the past, that's been well documented but the fact that they have been around for so long and even with those mistakes have carried on growing and developing new ideas kind of makes them a safe bet.
We all want the Nintendo NX to do well, just like I'm sure that Nintendo do, but if it doesn't it will certainly be a major blow, but not a fatal one just yet.