KenV, if I have understood the question correctly, then I can assure you that Link 16 can. Regardless of the number of sensors involved, as long as each contributing platform only produces one track for every friendly, enemy and other asset, the volume is the same. Good fusion ensures that, mostly.
Not needing to do secure voice on the net, not needing to put too much ac data (fuel states and such) and not needing to do enormous amounts of net management leaves a huge amount of space on even a single net, let alone stacked nets, should you need more space. Clearly there are other techniques and protocols that are not appropriate here.
Yes, Link 16 can handle the volume, but it may not be the medium of choice in tomorrow's lo observe world. But it will continue to have its place.
Oh, and the portal. And how did we get here from the WVR report?