If You're going to solder USB port (before it fell apart), + You're not writing too much to eMMC (flash absolute amount of write cycles), changing kernels many times a day via multiboot, using swap on external microSD (again absolute limit of flash write cycles), I don't see reasons why it shouldn't last for, lets say, 15 years or more

Of course, it depends on components and "luck"...

/Estel