Maybe, but I'm not so sure.I'm not saying we don't need Aztecs, they just have lower priority now.
You could use the same argument that we don't need Modern British either because we already have the Normans and America. And well I definitely don't expect the British to be a low priority civ.
As far as regional pathways go, I'm not sure why Mesoamerica doesn't need one right now when most other regions sort of already have a full one now? The Middle East/North Africa could have a Modern Age one like the Ottomans or Morocco, and Polynesia and South America will eventually need more than one civ, but that's it right now.