If that's the case then we are looking at really limited application. The magic of superconductivity pretty much vanishes the moment it has to interface with any non-superconducting medium. If you want to create lets say a superconducting winding for a magnet, the point of superconductivity is you can push a huge current through the winding with no heating. But nanocrystals can't accomplish it because there will inevitably be spaces between crystals and these spaces will have resistance and will generate heat.
Now, this does not mean there won't be some applications. Nanocrystals or not, they still can be used to levitate trains if we can perfect production of this exotic material.
And, the most important, we may learn more about superconductivity that will allow us to find other superconductors that do not have this limitation.