This would lead to a massive jump in efficiency. I think the I/O jump from 6 to 3 alone is huge. If I remember correctly Infinity Fabric is part of the I/O manufacturing process? If so that's a major boost to X3D.
Moore's Law is Dead (one of the most reputable leakers in the industry) has said that they will be using both N2P AND N2X nodes for Zen 6. Depends on the specific application.