Unless you are being given another vehicle for free, this is really a no-brainer. If Nissan replaces the transmission for free, keep the Pathfinder, and drive it until it no longer moves. As long as you properly maintain the transmission (have the fluid changed every 30,000 miles with approved CVT transmission fluid) and don’t abuse it, there is no reason to think you won’t get at least another 80,000 to 100,000 miles out of this vehicle.
Even assuming the new transmission only lasts for 40,000 miles, like the first one did, I still believe you will extract way more value from this vehicle by keeping it and driving it, versus selling/trading-in and buying something else. Also, the economy is about to crater in a big way, and taking on debt to buy a vehicle at this time would be unwise for anyone.