If your average lifetime is 2.5 years For a tool people come to depend on for their daily computing needs, this is wildly pessimistic. Look how many people use

If your average lifetime is 2.5 years For a tool people come to depend on for their daily computing needs, this is wildly pessimistic. Look how many people use Unix shell tools on a daily basis. Some of that stuff is 60 years old! Imagine paying a subscription for 60 years to use bash.