Transmission issue 2007 4wd Titan

I was driving yesterday and noticed that my transmission seemed to be slipping. I pulled off the road and saw that fluid was pouring out of the truck. Called a tow truck and had it taken to the local Nissan dealer. I was guessing a blown hose, line, or seal. They called me today and told me I need a new transmission. Does this seem reasonable? Truck has 97k miles. Had transmission flushed and fluid replaced by them at 85k miles. Never had any problems until yesterday. Any advice is appreciated.