"Unsustainable" might not be the exact right word for it. I mean, it's software - if you can compile it, and run it, it's not like age will actively deteriorate

"Unsustainable" might not be the exact right word for it. I mean, it's software - if you can compile it, and run it, it's not like age will actively deteriorate it like a physical good. (Bit rot is definitely a concern, but far less of one than e.g. salt corrosion.)