Yes, death is inevitable. The trick is, can you tell where your life rise ends and your fall begins? Doomed is typically identified at or after that point.

Windows hasn't been on the upswing since the early 2000s. According to this definition, the product has been doomed for over half its life.

Having worked at Microsoft from 2007 to 2016, I definitely saw windows during my almost tenure go from a growing profit center to all of a sudden having losses.