>You can probably squeeze an extra decade out if you're willing to swap out the motor or transmission
In many parts of the country (I'm Canadian, I assume the same for the US) the body and undercarriage are going to rot before the drivetrain goes.
This is the issue with mine here in Minnesota. Rust is the car killer.
If you stay on top of fluid filming or wool waxing you can largely avoid this. I've got 7 winters of WI slush and salt on my truck and just a few nickel sized spots of surface rust on the frame so far.