Ask MY1PATH about that and he'll say you're wrong. He stayed a week with his wife and baby at my house because his transmission suddenly failed on a trip down to California, thankfully it failed right around the corner from my house... 170 miles away from home with another 500 to go. It was a matter of pulling off the highway to get gas. It drove fine on the way in but it was toast when they tried to leave.
This was at 218K miles so you still have a long ways to go before even worrying about a transmission failure, especially if it's been taken good care of like you say. Run an aftermarket transmission cooler, at least 16K LBS, a filter, and for good measure drop the pan and make sure there's no particles of clutches. You should be good to go for a long time.